Library standards referenced

---
id: "schema:Organization"
label: Organization
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/Organization"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [Thing]
---

# Organization

> An organization such as a school, NGO, corporation, club, etc.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/Organization

## Parent types
- [[Thing]]

## Direct subtypes
- [[Airline]]
- [[Consortium]]
- [[Cooperative]]
- [[Corporation]]
- [[EducationalOrganization]]
- [[FundingScheme]]
- [[GovernmentOrganization]]
- [[LibrarySystem]]
- [[LocalBusiness]]
- [[MedicalOrganization]]
- [[NGO]]
- [[NewsMediaOrganization]]
- [[OnlineBusiness]]
- [[PerformingGroup]]
- [[PoliticalParty]]
- [[Project]]
- [[ResearchOrganization]]
- [[SearchRescueOrganization]]
- [[SportsOrganization]]
- [[WorkersUnion]]

## Properties (domain includes this type)
- [[acceptedPaymentMethod]]
- [[actionableFeedbackPolicy]]
- [[address]]
- [[agentInteractionStatistic]]
- [[aggregateRating]]
- [[alumni]]
- [[areaServed]]
- [[award]]
- [[awards]]
- [[brand]]
- [[companyRegistration]]
- [[contactPoint]]
- [[contactPoints]]
- [[correctionsPolicy]]
- [[department]]
- [[dissolutionDate]]
- [[diversityPolicy]]
- [[diversityStaffingReport]]
- [[duns]]
- [[email]]
- [[employee]]
- [[employees]]
- [[ethicsPolicy]]
- [[event]]
- [[events]]
- [[faxNumber]]
- [[founder]]
- [[founders]]
- [[foundingDate]]
- [[foundingLocation]]
- [[funder]]
- [[funding]]
- [[globalLocationNumber]]
- [[hasCertification]]
- [[hasCredential]]
- [[hasGS1DigitalLink]]
- [[hasMemberProgram]]
- [[hasMerchantReturnPolicy]]
- [[hasOfferCatalog]]
- [[hasPOS]]
- [[hasShippingService]]
- [[interactionStatistic]]
- [[isicV4]]
- [[iso6523Code]]
- [[keywords]]
- [[knowsAbout]]
- [[knowsLanguage]]
- [[legalAddress]]
- [[legalName]]
- [[legalRepresentative]]
- [[leiCode]]
- [[location]]
- [[logo]]
- [[makesOffer]]
- [[member]]
- [[memberOf]]
- [[members]]
- [[naics]]
- [[nonprofitStatus]]
- [[numberOfEmployees]]
- [[ownershipFundingInfo]]
- [[owns]]
- [[parentOrganization]]
- [[publishingPrinciples]]
- [[review]]
- [[reviews]]
- [[seeks]]
- [[serviceArea]]
- [[skills]]
- [[slogan]]
- [[sponsor]]
- [[subOrganization]]
- [[taxID]]
- [[telephone]]
- [[unnamedSourcesPolicy]]
- [[vatID]]

---
id: "schema:WebSite"
label: WebSite
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/WebSite"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [CreativeWork]
---

# WebSite

> A WebSite is a set of related web pages and other items typically served from a single web domain and accessible via URLs.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/WebSite

## Parent types
- [[CreativeWork]]

## Properties (domain includes this type)
- [[issn]]

---
id: "schema:WebPage"
label: WebPage
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/WebPage"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [CreativeWork]
---

# WebPage

> A web page. Every web page is implicitly assumed to be declared to be of type WebPage, so the various properties about that webpage, such as `breadcrumb` may be used. We recommend explicit declaration if these properties are specified, but if they are found outside of an itemscope, they will be assumed to be about the page.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/WebPage

## Parent types
- [[CreativeWork]]

## Direct subtypes
- [[AboutPage]]
- [[CheckoutPage]]
- [[CollectionPage]]
- [[ContactPage]]
- [[FAQPage]]
- [[ItemPage]]
- [[MedicalWebPage]]
- [[ProfilePage]]
- [[QAPage]]
- [[RealEstateListing]]
- [[SearchResultsPage]]

## Properties (domain includes this type)
- [[breadcrumb]]
- [[lastReviewed]]
- [[mainContentOfPage]]
- [[primaryImageOfPage]]
- [[relatedLink]]
- [[reviewedBy]]
- [[significantLink]]
- [[significantLinks]]
- [[speakable]]
- [[specialty]]

---
id: "schema:SoftwareApplication"
label: SoftwareApplication
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/SoftwareApplication"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [CreativeWork]
---

# SoftwareApplication

> A software application.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/SoftwareApplication

## Parent types
- [[CreativeWork]]

## Direct subtypes
- [[MobileApplication]]
- [[OperatingSystem]]
- [[RuntimePlatform]]
- [[VideoGame]]
- [[WebApplication]]

## Properties (domain includes this type)
- [[applicationCategory]]
- [[applicationSubCategory]]
- [[applicationSuite]]
- [[availableOnDevice]]
- [[countriesNotSupported]]
- [[countriesSupported]]
- [[device]]
- [[downloadUrl]]
- [[featureList]]
- [[fileSize]]
- [[installUrl]]
- [[memoryRequirements]]
- [[operatingSystem]]
- [[permissions]]
- [[processorRequirements]]
- [[releaseNotes]]
- [[requirements]]
- [[runtimePlatform]]
- [[screenshot]]
- [[softwareAddOn]]
- [[softwareHelp]]
- [[softwareRequirements]]
- [[softwareVersion]]
- [[storageRequirements]]
- [[supportingData]]

---
id: "schema:AggregateRating"
label: AggregateRating
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/AggregateRating"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [Rating]
---

# AggregateRating

> The average rating based on multiple ratings or reviews.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/AggregateRating

## Parent types
- [[Rating]]

## Direct subtypes
- [[EmployerAggregateRating]]

## Properties (domain includes this type)
- [[itemReviewed]]
- [[ratingCount]]
- [[reviewCount]]

---
id: "schema:Review"
label: Review
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/Review"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [CreativeWork]
---

# Review

> A review of an item - for example, of a restaurant, movie, or store.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/Review

## Parent types
- [[CreativeWork]]

## Direct subtypes
- [[ClaimReview]]
- [[CriticReview]]
- [[EmployerReview]]
- [[MediaReview]]
- [[Recommendation]]
- [[UserReview]]

## Properties (domain includes this type)
- [[associatedClaimReview]]
- [[associatedMediaReview]]
- [[associatedReview]]
- [[itemReviewed]]
- [[negativeNotes]]
- [[positiveNotes]]
- [[reviewAspect]]
- [[reviewBody]]
- [[reviewRating]]

---
id: "schema:FAQPage"
label: FAQPage
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/FAQPage"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [WebPage]
---

# FAQPage

> A [[FAQPage]] is a [[WebPage]] presenting one or more "[Frequently asked questions](https://en.wikipedia.org/wiki/FAQ)" (see also [[QAPage]]).

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/FAQPage

## Parent types
- [[WebPage]]

---
id: "schema:Question"
label: Question
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/Question"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [Comment]
---

# Question

> A specific question - e.g. from a user seeking answers online, or collected in a Frequently Asked Questions (FAQ) document.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/Question

## Parent types
- [[Comment]]

## Properties (domain includes this type)
- [[acceptedAnswer]]
- [[answerCount]]
- [[eduQuestionType]]
- [[parentItem]]
- [[suggestedAnswer]]

---
id: "schema:Answer"
label: Answer
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/Answer"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [Comment]
---

# Answer

> An answer offered to a question; perhaps correct, perhaps opinionated or wrong.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/Answer

## Parent types
- [[Comment]]

## Properties (domain includes this type)
- [[answerExplanation]]
- [[parentItem]]

---
id: "element:main"
label: main
kind: element
standard: html-elements
standard_title: HTML / SVG / MathML elements
source_url: "https://html.spec.whatwg.org/multipage/grouping-content.html#the-main-element"
license: reference
domain: [2]
ingest: full
group: html
dom_interface: HTMLElement
---

# main

The `<main>` HTML element, defined in HTML Standard. DOM interface: `HTMLElement`.

**Kind:** Element · **Group:** html · **DOM interface:** `HTMLElement` · **Source:** https://html.spec.whatwg.org/multipage/grouping-content.html#the-main-element

---
id: "element:nav"
label: nav
kind: element
standard: html-elements
standard_title: HTML / SVG / MathML elements
source_url: "https://html.spec.whatwg.org/multipage/sections.html#the-nav-element"
license: reference
domain: [2]
ingest: full
group: html
dom_interface: HTMLElement
---

# nav

The `<nav>` HTML element, defined in HTML Standard. DOM interface: `HTMLElement`.

**Kind:** Element · **Group:** html · **DOM interface:** `HTMLElement` · **Source:** https://html.spec.whatwg.org/multipage/sections.html#the-nav-element

---
id: "element:section"
label: section
kind: element
standard: html-elements
standard_title: HTML / SVG / MathML elements
source_url: "https://html.spec.whatwg.org/multipage/sections.html#the-section-element"
license: reference
domain: [2]
ingest: full
group: html
dom_interface: HTMLElement
---

# section

The `<section>` HTML element, defined in HTML Standard. DOM interface: `HTMLElement`.

**Kind:** Element · **Group:** html · **DOM interface:** `HTMLElement` · **Source:** https://html.spec.whatwg.org/multipage/sections.html#the-section-element

---
id: "element:blockquote"
label: blockquote
kind: element
standard: html-elements
standard_title: HTML / SVG / MathML elements
source_url: "https://html.spec.whatwg.org/multipage/grouping-content.html#the-blockquote-element"
license: reference
domain: [2]
ingest: full
group: html
dom_interface: HTMLQuoteElement
---

# blockquote

The `<blockquote>` HTML element, defined in HTML Standard. DOM interface: `HTMLQuoteElement`.

**Kind:** Element · **Group:** html · **DOM interface:** `HTMLQuoteElement` · **Source:** https://html.spec.whatwg.org/multipage/grouping-content.html#the-blockquote-element

---
id: "element:dl"
label: dl
kind: element
standard: html-elements
standard_title: HTML / SVG / MathML elements
source_url: "https://html.spec.whatwg.org/multipage/grouping-content.html#the-dl-element"
license: reference
domain: [2]
ingest: full
group: html
dom_interface: HTMLDListElement
---

# dl

The `<dl>` HTML element, defined in HTML Standard. DOM interface: `HTMLDListElement`.

**Kind:** Element · **Group:** html · **DOM interface:** `HTMLDListElement` · **Source:** https://html.spec.whatwg.org/multipage/grouping-content.html#the-dl-element

---
id: "element:link"
label: link
kind: element
standard: html-elements
standard_title: HTML / SVG / MathML elements
source_url: "https://html.spec.whatwg.org/multipage/semantics.html#the-link-element"
license: reference
domain: [2]
ingest: full
group: html
dom_interface: HTMLLinkElement
---

# link

The `<link>` HTML element, defined in HTML Standard. DOM interface: `HTMLLinkElement`.

**Kind:** Element · **Group:** html · **DOM interface:** `HTMLLinkElement` · **Source:** https://html.spec.whatwg.org/multipage/semantics.html#the-link-element

---
id: "element:meta"
label: meta
kind: element
standard: html-elements
standard_title: HTML / SVG / MathML elements
source_url: "https://html.spec.whatwg.org/multipage/semantics.html#meta"
license: reference
domain: [2]
ingest: full
group: html
dom_interface: HTMLMetaElement
---

# meta

The `<meta>` HTML element, defined in HTML Standard. DOM interface: `HTMLMetaElement`.

**Kind:** Element · **Group:** html · **DOM interface:** `HTMLMetaElement` · **Source:** https://html.spec.whatwg.org/multipage/semantics.html#meta

---
id: "css:clamp()"
label: clamp()
kind: function
standard: css
standard_title: CSS (mdn-data)
source_url: "https://developer.mozilla.org/docs/Web/CSS/clamp"
license: CC0-1.0
domain: [2]
ingest: full
css_status: standard
---

# clamp()

CSS function.

**Syntax:** `clamp( <calc-sum>#{3} )`

**Groups:** CSS Values and Units

**Kind:** Function · **Standard:** CSS (mdn-data) · **Status:** standard · **Source:** https://developer.mozilla.org/docs/Web/CSS/clamp

---
id: "css::focus-visible"
label: ":focus-visible"
kind: selector
standard: css
standard_title: CSS (mdn-data)
source_url: "https://developer.mozilla.org/docs/Web/CSS/:focus-visible"
license: CC0-1.0
domain: [2]
ingest: full
css_status: standard
---

# :focus-visible

CSS selector.

**Syntax:** `:focus-visible`

**Groups:** Selectors

**Kind:** Selector · **Standard:** CSS (mdn-data) · **Status:** standard · **Source:** https://developer.mozilla.org/docs/Web/CSS/:focus-visible

---
id: "css:backdrop-filter"
label: backdrop-filter
kind: property
standard: css
standard_title: CSS (mdn-data)
source_url: "https://developer.mozilla.org/docs/Web/CSS/backdrop-filter"
license: CC0-1.0
domain: [2]
ingest: full
css_status: standard
---

# backdrop-filter

CSS property.

**Syntax:** `none | <filter-value-list>`

**Inherited:** no
**Initial:** `none`
**Percentages:** no
**Applies to:** allElementsSVGContainerElements
**Groups:** Filter Effects

**Kind:** Property · **Standard:** CSS (mdn-data) · **Status:** standard · **Source:** https://developer.mozilla.org/docs/Web/CSS/backdrop-filter

---
id: "baseline:prefers-reduced-motion"
label: prefers-reduced-motion media query
kind: web-feature
standard: baseline
standard_title: Baseline (web-features)
source_url: "https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion"
license: Apache-2.0
domain: [2]
ingest: full
baseline: high
group: ""
baseline_since: 2020-01-15
---

# prefers-reduced-motion media query

> The prefers-reduced-motion CSS media query sets styles based on whether the user prefers to minimize the amount of non-essential animations on the device, such as scrolling, panning, zooming, and strobing.

**Baseline:** Widely available (Baseline) · since 2020-01-15

**Kind:** Web feature · **Standard:** Baseline (web-features) · **Source:** https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion

## Browser support (min version)
| Browser | Since |
|---|---|
| Chrome | 74 |
| Edge | 79 |
| Firefox | 63 |
| Safari | 10.1 |

## Links
- [Can I Use](https://caniuse.com/prefers-reduced-motion)
- [Specification](https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion)
- [Web Platform Status](https://webstatus.dev/features/prefers-reduced-motion)

---
id: "baseline:prefers-color-scheme"
label: prefers-color-scheme media query
kind: web-feature
standard: baseline
standard_title: Baseline (web-features)
source_url: "https://drafts.csswg.org/mediaqueries-5/#prefers-color-scheme"
license: Apache-2.0
domain: [2]
ingest: full
baseline: high
group: ""
baseline_since: 2020-01-15
---

# prefers-color-scheme media query

> The prefers-color-scheme CSS media query sets styles based on the requested color scheme, light or dark.

**Baseline:** Widely available (Baseline) · since 2020-01-15

**Kind:** Web feature · **Standard:** Baseline (web-features) · **Source:** https://drafts.csswg.org/mediaqueries-5/#prefers-color-scheme

## Browser support (min version)
| Browser | Since |
|---|---|
| Chrome | 76 |
| Edge | 79 |
| Firefox | 67 |
| Safari | 12.1 |

## Links
- [Specification](https://drafts.csswg.org/mediaqueries-5/#prefers-color-scheme)
- [Web Platform Status](https://webstatus.dev/features/prefers-color-scheme)

---
id: "baseline:font-display"
label: font-display
kind: web-feature
standard: baseline
standard_title: Baseline (web-features)
source_url: "https://drafts.csswg.org/css-fonts-4/#font-display-desc"
license: Apache-2.0
domain: [2]
ingest: full
baseline: high
group: ""
baseline_since: 2020-01-15
---

# font-display

> The font-display CSS descriptor sets whether to show a substitute font or nothing while a font face loads. The property manages what's known as a flash of unstyled text or flash of invisible text.

**Baseline:** Widely available (Baseline) · since 2020-01-15

**Kind:** Web feature · **Standard:** Baseline (web-features) · **Source:** https://drafts.csswg.org/css-fonts-4/#font-display-desc

## Browser support (min version)
| Browser | Since |
|---|---|
| Chrome | 60 |
| Edge | 79 |
| Firefox | 58 |
| Safari | 11.1 |

## Links
- [Can I Use](https://caniuse.com/css-font-rendering-controls)
- [Specification](https://drafts.csswg.org/css-fonts-4/#font-display-desc)
- [Web Platform Status](https://webstatus.dev/features/font-display)

---
id: "baseline:loading-lazy-media"
label: Lazy-loading media
kind: web-feature
standard: baseline
standard_title: Baseline (web-features)
source_url: "https://github.com/whatwg/html/pull/11980"
license: Apache-2.0
domain: [2]
ingest: full
baseline: False
group: ""
---

# Lazy-loading media

> The loading="lazy" attribute for  and  elements defers loading the media resource until the element is near the viewport. This matches the lazy-loading behavior for  and  elements.

**Baseline:** Limited availability

**Kind:** Web feature · **Standard:** Baseline (web-features) · **Source:** https://github.com/whatwg/html/pull/11980

## Browser support (min version)
| Browser | Since |
|---|---|
| Chrome | 150 |
| Edge | 150 |

## Links
- [Can I Use](https://caniuse.com/loading-lazy-media)
- [Specification](https://github.com/whatwg/html/pull/11980)
- [Web Platform Status](https://webstatus.dev/features/loading-lazy-media)

---
id: "baseline:meta-theme-color"
label: "<meta name=\"theme-color\">"
kind: web-feature
standard: baseline
standard_title: Baseline (web-features)
source_url: "https://html.spec.whatwg.org/multipage/semantics.html#meta-theme-color"
license: Apache-2.0
domain: [2]
ingest: full
baseline: False
group: ""
---

# <meta name="theme-color">

> The name="theme-color" attribute for the  HTML element suggests a color that the browser can use to customize the display of the page or the browser user interface.

**Baseline:** Limited availability

**Kind:** Web feature · **Standard:** Baseline (web-features) · **Source:** https://html.spec.whatwg.org/multipage/semantics.html#meta-theme-color

## Browser support (min version)
| Browser | Since |
|---|---|
| Safari | 15 |

## Links
- [Can I Use](https://caniuse.com/meta-theme-color)
- [Specification](https://html.spec.whatwg.org/multipage/semantics.html#meta-theme-color)
- [Web Platform Status](https://webstatus.dev/features/meta-theme-color)

---
id: "css:color-scheme"
label: color-scheme
kind: property
standard: css
standard_title: CSS (mdn-data)
source_url: "https://developer.mozilla.org/docs/Web/CSS/color-scheme"
license: CC0-1.0
domain: [2]
ingest: full
css_status: standard
---

# color-scheme

CSS property.

**Syntax:** `normal | [ light | dark | <custom-ident> ]+ && only?`

**Inherited:** yes
**Initial:** `normal`
**Percentages:** no
**Applies to:** allElementsAndText
**Groups:** CSS Color

**Kind:** Property · **Standard:** CSS (mdn-data) · **Status:** standard · **Source:** https://developer.mozilla.org/docs/Web/CSS/color-scheme

---
id: "wcag:3.1.1"
label: 3.1.1 Language of Page
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#language-of-page"
license: W3C-Document
domain: [3]
ingest: full
number: 3.1.1
level: A
principle: Understandable
guideline: Readable
---

# 3.1.1 Language of Page

**Level A**

> The default human language of each web page can be programmatically determined.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** A · **Source:** https://www.w3.org/TR/WCAG22/#language-of-page

## Context
- Principle: [[3-understandable|Understandable]]
- Guideline: [[3.1-readable|Readable]]

---
id: "wcag:1.3.1"
label: 1.3.1 Info and Relationships
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#info-and-relationships"
license: W3C-Document
domain: [3]
ingest: full
number: 1.3.1
level: A
principle: Perceivable
guideline: Adaptable
---

# 1.3.1 Info and Relationships

**Level A**

> Information, structure, and relationships conveyed through presentation can be programmatically determined or are available in text.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** A · **Source:** https://www.w3.org/TR/WCAG22/#info-and-relationships

## Context
- Principle: [[1-perceivable|Perceivable]]
- Guideline: [[1.3-adaptable|Adaptable]]

---
id: "wcag:2.4.10"
label: 2.4.10 Section Headings
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#section-headings"
license: W3C-Document
domain: [3]
ingest: full
number: 2.4.10
level: AAA
principle: Operable
guideline: Navigable
---

# 2.4.10 Section Headings

**Level AAA**

> Section headings are used to organize the content.

   "Heading" is used in its general sense and includes titles and other ways to add a
      heading to different types of content.

   This success criterion covers sections within writing, not user interface components. User interface components are covered under [Success Criterion 4.1.2](#name-role-value).

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** AAA · **Source:** https://www.w3.org/TR/WCAG22/#section-headings

## Context
- Principle: [[2-operable|Operable]]
- Guideline: [[2.4-navigable|Navigable]]

---
id: "wcag:1.1.1"
label: 1.1.1 Non-text Content
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#non-text-content"
license: W3C-Document
domain: [3]
ingest: full
number: 1.1.1
level: A
principle: Perceivable
guideline: Text Alternatives
---

# 1.1.1 Non-text Content

**Level A**

> All non-text content that is presented to the user has a text alternative that serves the equivalent purpose, except for the situations listed below.

      Controls, Input

If non-text content is a control or accepts user input, then it has a name that describes its purpose. (Refer to [Success Criterion 4.1.2](#name-role-value) for additional requirements for controls and content that accepts user input.)

      Time-Based Media

If non-text content is time-based media, then text alternatives at least provide descriptive
            identification of the non-text content. (Refer to [Guideline 1.2](#time-based-media) for additional requirements for media.)

      Test

If non-text content is a test or exercise that would be invalid if presented in text, then text alternatives at least provide descriptive identification of the non-text
            content.

      Sensory

If non-text content is primarily intended to create a specific sensory experience, then text alternatives at least provide descriptive identification of the non-text
            content.

      CAPTCHA

If the purpose of non-text content is to confirm that content is being accessed by
            a person rather than a computer, then text alternatives that identify and describe
            the purpose of the non-text content are provided, and alternative forms of CAPTCHA
            using output modes for different types of sensory perception are provided to accommodate
            different disabilities.

      Decoration, Formatting, Invisible

If non-text content is pure decoration, is used only for visual formatting, or is not presented to users, then it is implemented
            in a way that it can be ignored by assistive technology.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** A · **Source:** https://www.w3.org/TR/WCAG22/#non-text-content

## Context
- Principle: [[1-perceivable|Perceivable]]
- Guideline: [[1.1-text-alternatives|Text Alternatives]]

---
id: "wcag:1.4.3"
label: 1.4.3 Contrast (Minimum)
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#contrast-minimum"
license: W3C-Document
domain: [3]
ingest: full
number: 1.4.3
level: AA
principle: Perceivable
guideline: Distinguishable
---

# 1.4.3 Contrast (Minimum)

**Level AA**

> The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following:

      Large Text

Large-scale text and images of large-scale text have a contrast ratio of at least 3:1;

      Incidental

Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant
            other visual content, have no contrast requirement.

      Logotypes

Text that is part of a logo or brand name has no contrast requirement.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** AA · **Source:** https://www.w3.org/TR/WCAG22/#contrast-minimum

## Context
- Principle: [[1-perceivable|Perceivable]]
- Guideline: [[1.4-distinguishable|Distinguishable]]

---
id: "wcag:2.4.1"
label: 2.4.1 Bypass Blocks
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#bypass-blocks"
license: W3C-Document
domain: [3]
ingest: full
number: 2.4.1
level: A
principle: Operable
guideline: Navigable
---

# 2.4.1 Bypass Blocks

**Level A**

> A mechanism is available to bypass blocks of content that are repeated on multiple web pages.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** A · **Source:** https://www.w3.org/TR/WCAG22/#bypass-blocks

## Context
- Principle: [[2-operable|Operable]]
- Guideline: [[2.4-navigable|Navigable]]

---
id: "wcag:2.4.7"
label: 2.4.7 Focus Visible
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#focus-visible"
license: W3C-Document
domain: [3]
ingest: full
number: 2.4.7
level: AA
principle: Operable
guideline: Navigable
---

# 2.4.7 Focus Visible

**Level AA**

> Any keyboard operable user interface has a mode of operation where the keyboard focus indicator is visible.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** AA · **Source:** https://www.w3.org/TR/WCAG22/#focus-visible

## Context
- Principle: [[2-operable|Operable]]
- Guideline: [[2.4-navigable|Navigable]]

---
id: "wcag:2.4.11"
label: 2.4.11 Focus Not Obscured (Minimum)
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#focus-not-obscured-minimum"
license: W3C-Document
domain: [3]
ingest: full
number: 2.4.11
level: AA
principle: Operable
guideline: Navigable
change_2.2: New
---

# 2.4.11 Focus Not Obscured (Minimum)

**Level AA** · _New in WCAG 2.2_

> When a user interface component receives keyboard focus, the component is not entirely hidden due to author-created content.

    Where content in a configurable interface can be repositioned by the user, then only the initial positions of user-movable content are considered for testing and conformance of this success criterion.

    Content opened by the *user* may obscure the component receiving focus. If the user can reveal the focused component without advancing the keyboard focus, the component with focus is not considered visually hidden due to author-created content.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** AA · **Source:** https://www.w3.org/TR/WCAG22/#focus-not-obscured-minimum

## Context
- Principle: [[2-operable|Operable]]
- Guideline: [[2.4-navigable|Navigable]]

---
id: "wcag:2.4.13"
label: 2.4.13 Focus Appearance
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#focus-appearance"
license: W3C-Document
domain: [3]
ingest: full
number: 2.4.13
level: AAA
principle: Operable
guideline: Navigable
change_2.2: New
---

# 2.4.13 Focus Appearance

**Level AAA** · _New in WCAG 2.2_

> When the keyboard focus indicator is visible, an area of the focus indicator meets all the following:

        is at least as large as the area of a 2 CSS pixel thick perimeter of the unfocused component or sub-component, and
        has a contrast ratio of at least 3:1 between the same pixels in the focused and unfocused states.

Exceptions:

        The focus indicator is determined by the user agent and cannot be adjusted by the author, or
        The focus indicator and the indicator's background color are not modified by the author.

    What is perceived as the user interface component or sub-component (to determine the perimeter) depends on its visual presentation. The visual presentation includes the component's visible content, border, and component-specific background. It does not include shadow and glow effects outside the component's content, background, or border.

    Examples of sub-components that may receive a focus indicator are menu items in an opened drop-down menu, or focusable cells in a grid.

    Contrast calculations can be based on colors defined within the technology (such as HTML, CSS, and SVG). Pixels modified by user agent resolution enhancements and anti-aliasing can be ignored.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** AAA · **Source:** https://www.w3.org/TR/WCAG22/#focus-appearance

## Context
- Principle: [[2-operable|Operable]]
- Guideline: [[2.4-navigable|Navigable]]

---
id: "wcag:2.5.8"
label: 2.5.8 Target Size (Minimum)
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#target-size-minimum"
license: W3C-Document
domain: [3]
ingest: full
number: 2.5.8
level: AA
principle: Operable
guideline: Input Modalities
change_2.2: New
---

# 2.5.8 Target Size (Minimum)

**Level AA** · _New in WCAG 2.2_

> The size of the target for pointer inputs is at least 24 by 24 CSS pixels, except when:

        Spacing
        Undersized targets (those less than 24 by 24 CSS pixels) are positioned so that if a 24 CSS pixel diameter circle is centered on the bounding box of each, the circles do not intersect another target or the circle for another undersized target;
        Equivalent
        The function can be achieved through a different control on the same page that meets this criterion;
        Inline
        The target is in a sentence or its size is otherwise constrained by the line-height of non-target text;
        User Agent Control
        The size of the target is determined by the user agent and is not modified by the author;
        Essential
        A particular presentation of the target is essential or is legally required for the information being conveyed.

    Targets that allow for values to be selected spatially based on position within the target are considered one target for the purpose of the success criterion. Examples include sliders, color pickers displaying a gradient of colors, or editable areas where you position the cursor.

    For inline targets the line-height should be interpreted as perpendicular to the flow of text. For example, in a language displayed vertically, the line-height would be horizontal.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** AA · **Source:** https://www.w3.org/TR/WCAG22/#target-size-minimum

## Context
- Principle: [[2-operable|Operable]]
- Guideline: [[2.5-input-modalities|Input Modalities]]

---
id: "wcag:1.4.4"
label: 1.4.4 Resize Text
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#resize-text"
license: W3C-Document
domain: [3]
ingest: full
number: 1.4.4
level: AA
principle: Perceivable
guideline: Distinguishable
---

# 1.4.4 Resize Text

**Level AA**

> Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** AA · **Source:** https://www.w3.org/TR/WCAG22/#resize-text

## Context
- Principle: [[1-perceivable|Perceivable]]
- Guideline: [[1.4-distinguishable|Distinguishable]]

---
id: "wcag:1.4.10"
label: 1.4.10 Reflow
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#reflow"
license: W3C-Document
domain: [3]
ingest: full
number: 1.4.10
level: AA
principle: Perceivable
guideline: Distinguishable
---

# 1.4.10 Reflow

**Level AA**

> Content can be presented without loss of information or functionality, and without requiring scrolling in two dimensions for:

       Vertical scrolling content at a width equivalent to 320 CSS pixels;
       Horizontal scrolling content at a height equivalent to 256 CSS pixels.

Except for parts of the content which require two-dimensional layout for usage or meaning.

  320 CSS pixels is equivalent to a starting viewport width of 1280 CSS pixels wide at 400% zoom. For web content which is designed to scroll horizontally (e.g., with vertical text), 256 CSS pixels is equivalent to a starting viewport height of 1024 CSS pixels at 400% zoom.

   Examples of content which requires two-dimensional layout are images required for understanding (such as maps and diagrams), video, games, presentations, data tables (not individual cells), and interfaces where it is necessary to keep toolbars in view while manipulating content. It is acceptable to provide two-dimensional scrolling for such parts of the content.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** AA · **Source:** https://www.w3.org/TR/WCAG22/#reflow

## Context
- Principle: [[1-perceivable|Perceivable]]
- Guideline: [[1.4-distinguishable|Distinguishable]]

---
id: "wcag:4.1.2"
label: "4.1.2 Name, Role, Value"
kind: success-criterion
standard: wcag-2.2
standard_title: WCAG 2.2
source_url: "https://www.w3.org/TR/WCAG22/#name-role-value"
license: W3C-Document
domain: [3]
ingest: full
number: 4.1.2
level: A
principle: Robust
guideline: Compatible
---

# 4.1.2 Name, Role, Value

**Level A**

> For all user interface components (including but not limited to: form elements, links and components generated by scripts),
     the name and role can be programmatically determined; states, properties, and values that can be set by the user can be programmatically set; and notification of changes to these items is available to user agents, including assistive technologies.

   This success criterion is primarily for web authors who develop or script their own
      user interface components. For example, standard HTML controls already meet this success
      criterion when used according to specification.

**Kind:** Success Criterion · **Standard:** WCAG 2.2 · **Level:** A · **Source:** https://www.w3.org/TR/WCAG22/#name-role-value

## Context
- Principle: [[4-robust|Robust]]
- Guideline: [[4.1-compatible|Compatible]]

---
id: "aria-apg:tabs"
label: Tabs
kind: pattern
standard: aria-apg
standard_title: ARIA Authoring Practices Guide (APG)
source_url: "https://www.w3.org/WAI/ARIA/apg/patterns/tabs/"
license: W3C-Document
domain: [3]
ingest: reference
---

# Tabs

Tabs organize content into layered panels where only one panel is shown at a time, selected by a row of tab controls. A role=tablist contains role=tab elements whose aria-selected and aria-controls tie each tab to its role=tabpanel, and a roving tabindex keeps only the active tab tabbable. Left/Right or Up/Down arrows move between tabs, Home and End jump to the first and last tab, and activation can follow focus automatically or wait for Enter or Space.

**Kind:** Pattern · **Standard:** ARIA Authoring Practices Guide (APG) · **Source:** https://www.w3.org/WAI/ARIA/apg/patterns/tabs/

---
id: "aria:banner"
label: banner
kind: role
standard: wai-aria
standard_title: WAI-ARIA 1.2
source_url: "https://www.w3.org/TR/wai-aria-1.2/#banner"
license: W3C-Document
domain: [3]
ingest: full
abstract: false
---

# banner

WAI-ARIA role.

**Kind:** Role · **Standard:** WAI-ARIA 1.2 · **Source:** https://www.w3.org/TR/wai-aria-1.2/#banner

## Inherits from
- [[landmark]]

## Supported states & properties
- [[aria-atomic]]
- [[aria-busy]]
- [[aria-controls]]
- [[aria-current]]
- [[aria-describedby]]
- [[aria-details]]
- [[aria-dropeffect]]
- [[aria-flowto]]
- [[aria-grabbed]]
- [[aria-hidden]]
- [[aria-keyshortcuts]]
- [[aria-label]]
- [[aria-labelledby]]
- [[aria-live]]
- [[aria-owns]]
- [[aria-relevant]]
- [[aria-roledescription]]

## Name from
- author

---
id: "aria:navigation"
label: navigation
kind: role
standard: wai-aria
standard_title: WAI-ARIA 1.2
source_url: "https://www.w3.org/TR/wai-aria-1.2/#navigation"
license: W3C-Document
domain: [3]
ingest: full
abstract: false
---

# navigation

WAI-ARIA role.

**Kind:** Role · **Standard:** WAI-ARIA 1.2 · **Source:** https://www.w3.org/TR/wai-aria-1.2/#navigation

## Inherits from
- [[landmark]]

## Supported states & properties
- [[aria-atomic]]
- [[aria-busy]]
- [[aria-controls]]
- [[aria-current]]
- [[aria-describedby]]
- [[aria-details]]
- [[aria-dropeffect]]
- [[aria-flowto]]
- [[aria-grabbed]]
- [[aria-hidden]]
- [[aria-keyshortcuts]]
- [[aria-label]]
- [[aria-labelledby]]
- [[aria-live]]
- [[aria-owns]]
- [[aria-relevant]]
- [[aria-roledescription]]

## Name from
- author

---
id: "aria:contentinfo"
label: contentinfo
kind: role
standard: wai-aria
standard_title: WAI-ARIA 1.2
source_url: "https://www.w3.org/TR/wai-aria-1.2/#contentinfo"
license: W3C-Document
domain: [3]
ingest: full
abstract: false
---

# contentinfo

WAI-ARIA role.

**Kind:** Role · **Standard:** WAI-ARIA 1.2 · **Source:** https://www.w3.org/TR/wai-aria-1.2/#contentinfo

## Inherits from
- [[landmark]]

## Supported states & properties
- [[aria-atomic]]
- [[aria-busy]]
- [[aria-controls]]
- [[aria-current]]
- [[aria-describedby]]
- [[aria-details]]
- [[aria-dropeffect]]
- [[aria-flowto]]
- [[aria-grabbed]]
- [[aria-hidden]]
- [[aria-keyshortcuts]]
- [[aria-label]]
- [[aria-labelledby]]
- [[aria-live]]
- [[aria-owns]]
- [[aria-relevant]]
- [[aria-roledescription]]

## Name from
- author

---
id: "aria:tablist"
label: tablist
kind: role
standard: wai-aria
standard_title: WAI-ARIA 1.2
source_url: "https://www.w3.org/TR/wai-aria-1.2/#tablist"
license: W3C-Document
domain: [3]
ingest: full
abstract: false
---

# tablist

WAI-ARIA role.

**Kind:** Role · **Standard:** WAI-ARIA 1.2 · **Source:** https://www.w3.org/TR/wai-aria-1.2/#tablist

## Inherits from
- [[composite]]

## Supported states & properties
- [[aria-activedescendant]]
- [[aria-atomic]]
- [[aria-busy]]
- [[aria-controls]]
- [[aria-current]]
- [[aria-describedby]]
- [[aria-details]]
- [[aria-disabled]]
- [[aria-dropeffect]]
- [[aria-flowto]]
- [[aria-grabbed]]
- [[aria-hidden]]
- [[aria-keyshortcuts]]
- [[aria-label]]
- [[aria-labelledby]]
- [[aria-level]]
- [[aria-live]]
- [[aria-multiselectable]]
- [[aria-orientation]]
- [[aria-owns]]
- [[aria-relevant]]
- [[aria-roledescription]]

## Name from
- author

---
id: "core-web-vitals:lcp"
label: Largest Contentful Paint (LCP)
kind: metric
standard: core-web-vitals
standard_title: "Core Web Vitals & Web Vitals metrics"
source_url: "https://web.dev/articles/lcp"
license: reference
domain: [4]
ingest: reference
---

# Largest Contentful Paint (LCP)

LCP records how long it takes for the single largest image or text block in the viewport to render, marking the point at which the main content has visibly loaded. It is the Core Web Vital for perceived loading speed. Slow LCP usually traces back to server response time, render-blocking resources, or heavy hero assets.

**Kind:** Metric · **Standard:** Core Web Vitals & Web Vitals metrics · **Source:** https://web.dev/articles/lcp

- **good:** <2.5s
- **needs_improvement:** 2.5s-4.0s
- **poor:** >4.0s
- **measures:** loading performance
- **type:** core

## Related
- [[Time-to-First-Byte-TTFB|Time to First Byte (TTFB)]]
- [[First-Contentful-Paint-FCP|First Contentful Paint (FCP)]]

---
id: "core-web-vitals:cls"
label: Cumulative Layout Shift (CLS)
kind: metric
standard: core-web-vitals
standard_title: "Core Web Vitals & Web Vitals metrics"
source_url: "https://web.dev/articles/cls"
license: reference
domain: [4]
ingest: reference
---

# Cumulative Layout Shift (CLS)

CLS sums the unexpected movement of visible elements during the page's lifespan, scoring how often content jumps as fonts, images, or ads load in. It is the Core Web Vital for visual stability and is a unitless score rather than a time. Reserving space for media and embeds is the most common way to keep it low.

**Kind:** Metric · **Standard:** Core Web Vitals & Web Vitals metrics · **Source:** https://web.dev/articles/cls

- **good:** <0.1
- **needs_improvement:** 0.1-0.25
- **poor:** >0.25
- **measures:** visual stability
- **type:** core

## Related
- [[Largest-Contentful-Paint-LCP|Largest Contentful Paint (LCP)]]

---
id: "core-web-vitals:fcp"
label: First Contentful Paint (FCP)
kind: metric
standard: core-web-vitals
standard_title: "Core Web Vitals & Web Vitals metrics"
source_url: "https://web.dev/articles/fcp"
license: reference
domain: [4]
ingest: reference
---

# First Contentful Paint (FCP)

FCP captures the moment the browser paints the first piece of DOM content, giving the user their first signal that the page is actually loading. It is a supporting diagnostic metric rather than a Core Web Vital and helps explain slow LCP. Render-blocking CSS and JavaScript are its typical bottlenecks.

**Kind:** Metric · **Standard:** Core Web Vitals & Web Vitals metrics · **Source:** https://web.dev/articles/fcp

- **good:** <1.8s
- **needs_improvement:** 1.8s-3.0s
- **poor:** >3.0s
- **measures:** loading (first paint)
- **type:** supporting

## Related
- [[Largest-Contentful-Paint-LCP|Largest Contentful Paint (LCP)]]
- [[Time-to-First-Byte-TTFB|Time to First Byte (TTFB)]]

---
id: "open-graph:og-type"
label: "og:type"
kind: property
standard: open-graph
standard_title: Open Graph Protocol
source_url: "https://ogp.me/#types"
license: reference
domain: [5]
ingest: reference
---

# og:type

Declares what kind of object the page represents, for example website, article, or music.song, which in turn unlocks a set of type-specific properties. If omitted it defaults to website. The chosen value determines which vertical vocabulary (article:, book:, music:, video:, profile:) may be attached.

**Kind:** Property · **Standard:** Open Graph Protocol · **Source:** https://ogp.me/#types

- **required:** yes
- **default:** website

## Related
- [[article]]
- [[book]]
- [[music.song]]
- [[video.movie]]
- [[profile]]
- [[website]]

---
id: "open-graph:og-title"
label: "og:title"
kind: property
standard: open-graph
standard_title: Open Graph Protocol
source_url: "https://ogp.me/#metadata"
license: reference
domain: [5]
ingest: reference
---

# og:title

Sets the human-readable title of the object as it should appear in the graph, such as a headline or product name. It is one of the four properties every Open Graph page is required to declare. Sharing surfaces usually render it as the bold heading of the preview card.

**Kind:** Property · **Standard:** Open Graph Protocol · **Source:** https://ogp.me/#metadata

- **required:** yes
- **group:** basic

## Related
- [[og-type|og:type]]
- [[og-description|og:description]]
- [[og-url|og:url]]

---
id: "open-graph:og-image"
label: "og:image"
kind: property
standard: open-graph
standard_title: Open Graph Protocol
source_url: "https://ogp.me/#structured"
license: reference
domain: [5]
ingest: reference
---

# og:image

Points to an image URL that visually represents the object in the graph and appears as the thumbnail in shared previews. A page may list several og:image tags so consumers can pick the best fit. It anchors a family of structured sub-properties describing the image's dimensions, type, and alt text.

**Kind:** Property · **Standard:** Open Graph Protocol · **Source:** https://ogp.me/#structured

- **required:** yes
- **repeatable:** yes

## Related
- [[og-image-url|og:image:url]]
- [[og-image-secure_url|og:image:secure_url]]
- [[og-image-alt|og:image:alt]]

---
id: "open-graph:og-image-alt"
label: "og:image:alt"
kind: property
standard: open-graph
standard_title: Open Graph Protocol
source_url: "https://ogp.me/#structured"
license: reference
domain: [5]
ingest: reference
---

# og:image:alt

Supplies a text description of the image for people who cannot see it, mirroring an HTML alt attribute. It should describe the picture rather than restate the page title. Accessible sharing surfaces expose it to assistive technology.

**Kind:** Property · **Standard:** Open Graph Protocol · **Source:** https://ogp.me/#structured

- **group:** image
- **accessibility:** yes

## Related
- [[og-image|og:image]]

---
id: "open-graph:og-description"
label: "og:description"
kind: property
standard: open-graph
standard_title: Open Graph Protocol
source_url: "https://ogp.me/#optional"
license: reference
domain: [5]
ingest: reference
---

# og:description

Offers a one- or two-sentence summary of the object shown beneath the title in preview cards. It is optional but strongly recommended because it drives click-through. Keeping it concise avoids truncation across different platforms.

**Kind:** Property · **Standard:** Open Graph Protocol · **Source:** https://ogp.me/#optional

- **group:** optional

## Related
- [[og-title|og:title]]
- [[og-site_name|og:site_name]]

---
id: "google-rich-results:software-app"
label: Software app
kind: rich-result-type
standard: google-rich-results
standard_title: Google-supported structured data (rich result) types
source_url: "https://developers.google.com/search/docs/appearance/structured-data/software-app"
license: reference
domain: [5]
ingest: reference
---

# Software app

Describes an application with its rating, price, and operating system so Google can present an app rich result. It highlights key install and quality signals in Search. Aimed at app publishers and download pages.

**Kind:** Rich Result Type · **Standard:** Google-supported structured data (rich result) types · **Source:** https://developers.google.com/search/docs/appearance/structured-data/software-app

- **schema:** SoftwareApplication

## Related
- [[Review-snippet|Review snippet]]

---
id: "google-rich-results:review-snippet"
label: Review snippet
kind: rich-result-type
standard: google-rich-results
standard_title: Google-supported structured data (rich result) types
source_url: "https://developers.google.com/search/docs/appearance/structured-data/review-snippet"
license: reference
domain: [5]
ingest: reference
---

# Review snippet

Attaches a rating or short review excerpt to another entity such as a product, business, or recipe. Google can then show star ratings in the result. Aggregate ratings summarize many reviews into a single score.

**Kind:** Rich Result Type · **Standard:** Google-supported structured data (rich result) types · **Source:** https://developers.google.com/search/docs/appearance/structured-data/review-snippet

- **schema:** Review / AggregateRating

## Related
- [[Product]]
- [[Local-business|Local business]]
- [[Movie]]

---
id: "twitter-cards:summary-large-image"
label: summary_large_image
kind: tag
standard: twitter-cards
standard_title: X (Twitter) Cards
source_url: "https://developer.x.com/en/docs/x-for-websites/cards/overview/summary-card-with-large-image"
license: reference
domain: [5]
ingest: reference
---

# summary_large_image

Is a card type that places a large, edge-to-edge image above the title and description. It is favored for visually driven content where the picture leads. It uses the same tags as summary but renders the image much larger.

**Kind:** Tag · **Standard:** X (Twitter) Cards · **Source:** https://developer.x.com/en/docs/x-for-websites/cards/overview/summary-card-with-large-image

- **group:** card-type

## Related
- [[summary]]
- [[twitter-image|twitter:image]]

---
id: "robots-txt:robots-meta-tag"
label: Robots meta tag
kind: directive
standard: robots-txt
standard_title: Robots Exclusion Protocol (RFC 9309)
source_url: "https://developers.google.com/search/docs/crawling-indexing/robots-meta-tag"
license: IETF-Trust
domain: [5]
ingest: reference
---

# Robots meta tag

Is an HTML meta element in a page's head that carries per-page indexing directives such as noindex or nofollow to crawlers. Unlike robots.txt it controls indexing and link following rather than fetching. It only works if the crawler is allowed to fetch the page in the first place.

**Kind:** Directive · **Standard:** Robots Exclusion Protocol (RFC 9309) · **Source:** https://developers.google.com/search/docs/crawling-indexing/robots-meta-tag

- **concept:** yes
- **location:** html head

## Related
- [[noindex]]
- [[nofollow]]
- [[X-Robots-Tag]]

---
id: "google-search-essentials:descriptive-titles"
label: Descriptive titles and snippets
kind: policy
standard: google-search-essentials
standard_title: "Google Search Essentials & Spam Policies"
source_url: "https://developers.google.com/search/docs/appearance/title-link"
license: reference
domain: [5]
ingest: reference
---

# Descriptive titles and snippets

Clear, accurate title elements and meta descriptions help both users and Google understand what a page offers. Unique, descriptive titles improve how results are presented and clicked. Vague or duplicated titles weaken a page's presentation in Search.

**Kind:** Policy · **Standard:** Google Search Essentials & Spam Policies · **Source:** https://developers.google.com/search/docs/appearance/title-link

- **category:** best-practice

## Related
- [[Helpful-people-first-content|Helpful, people-first content]]

---
id: "google-search-essentials:image-alt-text"
label: Descriptive alt text for images
kind: policy
standard: google-search-essentials
standard_title: "Google Search Essentials & Spam Policies"
source_url: "https://developers.google.com/search/docs/appearance/google-images"
license: reference
domain: [5]
ingest: reference
---

# Descriptive alt text for images

Alt attributes describe an image's content so Google and assistive technologies can interpret it. Meaningful alt text improves accessibility and helps images rank in image search. Missing or keyword-stuffed alt text reduces its value.

**Kind:** Policy · **Standard:** Google Search Essentials & Spam Policies · **Source:** https://developers.google.com/search/docs/appearance/google-images

- **category:** best-practice

## Related
- [[Keyword-stuffing|Keyword stuffing]]

---
id: "google-search-essentials:mobile-friendly"
label: Mobile-friendly and fast pages
kind: policy
standard: google-search-essentials
standard_title: "Google Search Essentials & Spam Policies"
source_url: "https://developers.google.com/search/docs/appearance/page-experience"
license: reference
domain: [5]
ingest: reference
---

# Mobile-friendly and fast pages

Because Google indexes with a mobile crawler, pages should render well and load quickly on phones. A responsive layout and good page experience help users and support performance in Search. Poor mobile usability can limit visibility.

**Kind:** Policy · **Standard:** Google Search Essentials & Spam Policies · **Source:** https://developers.google.com/search/docs/appearance/page-experience

- **category:** best-practice

## Related
- [[Indexable-content-format|Indexable content format]]

---
id: "eeat-qrg:experience"
label: Experience
kind: concept
standard: eeat-qrg
standard_title: "Search Quality Rater concepts (E-E-A-T & Page Quality)"
source_url: "https://developers.google.com/search/blog/2022/12/google-raters-guidelines-e-e-a-t"
license: reference
domain: [5]
ingest: reference
---

# Experience

Assesses whether the content creator has first-hand or life experience with the topic they cover. A review written by someone who actually used a product, or a guide by someone who has done the task, carries more weight. It is the first pillar added to the older E-A-T framework, making it E-E-A-T.

**Kind:** Concept · **Standard:** Search Quality Rater concepts (E-E-A-T & Page Quality) · **Source:** https://developers.google.com/search/blog/2022/12/google-raters-guidelines-e-e-a-t

- **pillar:** E-E-A-T

## Related
- [[Expertise]]
- [[Trust]]

---
id: "dtcg-tokens:design-token"
label: design token
kind: token-type
standard: dtcg-tokens
standard_title: Design Tokens Format Module
source_url: "https://www.designtokens.org/tr/drafts/format/#design-token"
license: CC-BY-4.0
domain: [6]
ingest: reference
---

# design token

A design token is the fundamental unit of the format: a named entity that stores a single design decision such as a color or spacing value. In JSON it is an object carrying at least a $value, and it may add a $type and $description. Tokens let teams share design values across tools and platforms.

**Kind:** Token Type · **Standard:** Design Tokens Format Module · **Source:** https://www.designtokens.org/tr/drafts/format/#design-token

- **category:** concept

## Related
- [[value|$value]]
- [[type|$type]]
- [[group]]

---
id: "dtcg-tokens:color"
label: color
kind: token-type
standard: dtcg-tokens
standard_title: Design Tokens Format Module
source_url: "https://www.designtokens.org/tr/drafts/format/#color"
license: CC-BY-4.0
domain: [6]
ingest: reference
---

# color

The color type represents a color value used for fills, text, borders, and other visual properties. In the current specification its value is an object with a color space plus channel components, allowing colors beyond the sRGB gamut. Tools resolve it to whatever format a target platform requires.

**Kind:** Token Type · **Standard:** Design Tokens Format Module · **Source:** https://www.designtokens.org/tr/drafts/format/#color

- **category:** basic

## Related
- [[type|$type]]
- [[value|$value]]
- [[gradient]]
- [[shadow]]

---
id: "gestalt-principles:proximity"
label: Proximity
kind: principle
standard: gestalt-principles
standard_title: Gestalt Principles of Visual Perception
source_url: "https://www.nngroup.com/articles/gestalt-proximity/"
license: reference
domain: [6]
ingest: reference
---

# Proximity

Objects positioned close together are perceived as more related than objects that are farther apart. Spatial grouping lets designers convey relationships using layout alone, without borders or lines. Deliberate spacing organizes content and signals which items belong together.

**Kind:** Principle · **Standard:** Gestalt Principles of Visual Perception · **Source:** https://www.nngroup.com/articles/gestalt-proximity/


## Related
- [[Common-Region|Common Region]]
- [[Similarity]]

---
id: "gestalt-principles:common-region"
label: Common Region
kind: principle
standard: gestalt-principles
standard_title: Gestalt Principles of Visual Perception
source_url: "https://www.nngroup.com/articles/common-region/"
license: reference
domain: [6]
ingest: reference
---

# Common Region

Elements enclosed within a shared boundary are perceived as a single group, even overriding proximity. Backgrounds, borders, and containers create strong grouping cues. Cards and panels rely on this principle to bundle related content.

**Kind:** Principle · **Standard:** Gestalt Principles of Visual Perception · **Source:** https://www.nngroup.com/articles/common-region/


## Related
- [[Proximity]]

---
id: "gestalt-principles:similarity"
label: Similarity
kind: principle
standard: gestalt-principles
standard_title: Gestalt Principles of Visual Perception
source_url: "https://www.nngroup.com/articles/similarity-principle-in-visual-design/"
license: reference
domain: [6]
ingest: reference
---

# Similarity

Elements that look alike in attributes such as color, shape, or size are perceived as part of the same group. Shared styling creates a sense of connection even when items are spread apart. This helps users recognize categories and relationships across an interface.

**Kind:** Principle · **Standard:** Gestalt Principles of Visual Perception · **Source:** https://www.nngroup.com/articles/similarity-principle-in-visual-design/


## Related
- [[Proximity]]

---
id: "nng-heuristics:7"
label: Flexibility and Efficiency of Use
kind: heuristic
standard: nng-heuristics
standard_title: Nielsen Norman 10 Usability Heuristics
source_url: "https://www.nngroup.com/articles/flexibility-efficiency-heuristic/"
license: reference
domain: [6]
ingest: reference
---

# Flexibility and Efficiency of Use

Systems should serve both novices and experts, letting frequent users tailor and accelerate common actions. Shortcuts, accelerators, and personalization allow experienced people to work faster while remaining invisible to newcomers. Catering to a range of skill levels makes the product efficient without sacrificing approachability.

**Kind:** Heuristic · **Standard:** Nielsen Norman 10 Usability Heuristics · **Source:** https://www.nngroup.com/articles/flexibility-efficiency-heuristic/


## Related
- [[Recognition-Rather-Than-Recall|Recognition Rather Than Recall]]

---
id: "plain-language:headings"
label: Use headings
kind: guideline
standard: plain-language
standard_title: Federal Plain Language Guidelines
source_url: "https://www.plainlanguage.gov/guidelines/design/use-headings/"
license: US-Gov-PublicDomain
domain: [7]
ingest: reference
---

# Use headings

Break content into sections with informative headings, including question-form headings that mirror what readers ask. Clear headings let people skim and jump to the part that concerns them. They also reveal the document's structure at a glance.

**Kind:** Guideline · **Standard:** Federal Plain Language Guidelines · **Source:** https://www.plainlanguage.gov/guidelines/design/use-headings/

- **group:** Design your document

## Related
- [[Organize-the-information|Organize the information]]
- [[Use-lists-and-tables|Use lists and tables]]

---
id: "plain-language:lists-and-tables"
label: Use lists and tables
kind: guideline
standard: plain-language
standard_title: Federal Plain Language Guidelines
source_url: "https://www.plainlanguage.gov/guidelines/design/use-lists/"
license: US-Gov-PublicDomain
domain: [7]
ingest: reference
---

# Use lists and tables

Convert complex sequences, conditions, or comparisons into bulleted or numbered lists and tables that readers can scan. Structured layout exposes relationships that get buried inside long prose paragraphs. Lists and tables make eligibility rules and steps far easier to follow.

**Kind:** Guideline · **Standard:** Federal Plain Language Guidelines · **Source:** https://www.plainlanguage.gov/guidelines/design/use-lists/

- **group:** Design your document

## Related
- [[Use-headings|Use headings]]
- [[Organize-the-information|Organize the information]]

---
id: "gdpr:consent"
label: Consent
kind: provision
standard: gdpr
standard_title: General Data Protection Regulation (EU 2016/679)
source_url: "https://gdpr.eu/"
license: reference
domain: [9]
ingest: reference
---

# Consent

Where processing relies on consent, the regulation requires that consent be freely given, specific, informed, and unambiguous, and that the controller be able to demonstrate it. Consent must be as easy to withdraw as to give. Pre-ticked boxes and silence do not constitute valid consent.

**Kind:** Provision · **Standard:** General Data Protection Regulation (EU 2016/679) · **Source:** https://gdpr.eu/

- **type:** provision
- **article:** 7

---
id: "gdpr:principle-lawfulness-fairness-transparency"
label: "Lawfulness, fairness and transparency"
kind: provision
standard: gdpr
standard_title: General Data Protection Regulation (EU 2016/679)
source_url: "https://gdpr.eu/"
license: reference
domain: [9]
ingest: reference
---

# Lawfulness, fairness and transparency

The first data protection principle requires that personal data be processed lawfully, fairly, and in a transparent manner in relation to the individual. Processing must rest on a valid legal ground and must not mislead the person about what happens to their data. People should be able to understand how and why their data is used.

**Kind:** Provision · **Standard:** General Data Protection Regulation (EU 2016/679) · **Source:** https://gdpr.eu/

- **type:** principle
- **article:** 5

---
id: "eprivacy:cookie-consent"
label: Cookie consent requirement
kind: provision
standard: eprivacy
standard_title: ePrivacy Directive (2002/58/EC)
source_url: "https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32002L0058"
license: reference
domain: [9]
ingest: reference
---

# Cookie consent requirement

This provision requires that storing information, or gaining access to information already stored, on a user's device is allowed only with the user's informed consent. It is the legal basis for cookie banners across the EU. Users must be given clear information about the purposes before consenting.

**Kind:** Provision · **Standard:** ePrivacy Directive (2002/58/EC) · **Source:** https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32002L0058

- **article:** 5(3)

---
id: "deceptive-patterns:obstruction"
label: Obstruction
kind: pattern
standard: deceptive-patterns
standard_title: Deceptive Design (Dark Patterns) Taxonomy
source_url: "https://www.deceptive.design/types/obstruction"
license: reference
domain: [6]
ingest: reference
---

# Obstruction

Obstruction makes a particular action needlessly hard so users are steered toward an easier, business-friendly path. Extra steps and roadblocks are placed in front of choices the company would prefer people avoid. The added effort discourages the intended action.

**Kind:** Pattern · **Standard:** Deceptive Design (Dark Patterns) Taxonomy · **Source:** https://www.deceptive.design/types/obstruction


## Related
- [[Hard-to-Cancel|Hard to Cancel]]

---
id: "deceptive-patterns:preselection"
label: Preselection
kind: pattern
standard: deceptive-patterns
standard_title: Deceptive Design (Dark Patterns) Taxonomy
source_url: "https://www.deceptive.design/types/preselection"
license: reference
domain: [6]
ingest: reference
---

# Preselection

Preselection sets a default option in favor of the business rather than the user, betting that people will not change it. Checkboxes for extra purchases, data sharing, or subscriptions are ticked in advance. Reliance on inertia nudges users into choices they might not make deliberately.

**Kind:** Pattern · **Standard:** Deceptive Design (Dark Patterns) Taxonomy · **Source:** https://www.deceptive.design/types/preselection


## Related
- [[Sneaking]]

---
id: "deceptive-patterns:confirmshaming"
label: Confirmshaming
kind: pattern
standard: deceptive-patterns
standard_title: Deceptive Design (Dark Patterns) Taxonomy
source_url: "https://www.deceptive.design/types/confirmshaming"
license: reference
domain: [6]
ingest: reference
---

# Confirmshaming

Confirmshaming uses guilt or shame in the wording of a decline option to discourage users from opting out. The dismissive choice is phrased to make people feel foolish or wrong for saying no. Emotional manipulation pressures users toward the option the business prefers.

**Kind:** Pattern · **Standard:** Deceptive Design (Dark Patterns) Taxonomy · **Source:** https://www.deceptive.design/types/confirmshaming


## Related
- [[Trick-Wording|Trick Wording]]

---
id: "geo-tactics:cite-sources"
label: Cite sources
kind: tactic
standard: geo-tactics
standard_title: Generative Engine Optimization tactics
source_url: "https://arxiv.org/abs/2311.09735"
license: reference
domain: [5]
ingest: reference
---

# Cite sources

Adding citations to credible external sources for the claims made in the content. In the GEO study this was among the most effective tactics, meaningfully raising a source's visibility in generated answers. It signals reliability that generative engines reward when composing responses.

**Kind:** Tactic · **Standard:** Generative Engine Optimization tactics · **Source:** https://arxiv.org/abs/2311.09735

- **effect:** improves visibility
- **strength:** top performer

## Related
- [[Add-quotations|Add quotations]]
- [[Add-statistics|Add statistics]]

---
id: "geo-tactics:add-statistics"
label: Add statistics
kind: tactic
standard: geo-tactics
standard_title: Generative Engine Optimization tactics
source_url: "https://arxiv.org/abs/2311.09735"
license: reference
domain: [5]
ingest: reference
---

# Add statistics

Enriching content with relevant quantitative data and statistics instead of qualitative claims alone. The study found it consistently boosted visibility across metrics and paired well with fluency optimization for peak results. It was particularly strong for law, government, and opinion-type queries.

**Kind:** Tactic · **Standard:** Generative Engine Optimization tactics · **Source:** https://arxiv.org/abs/2311.09735

- **effect:** improves visibility
- **strength:** top performer

## Related
- [[Cite-sources|Cite sources]]
- [[Add-quotations|Add quotations]]
- [[Fluency-optimization|Fluency optimization]]

---
id: "geo-tactics:authoritative-tone"
label: Authoritative tone
kind: tactic
standard: geo-tactics
standard_title: Generative Engine Optimization tactics
source_url: "https://arxiv.org/abs/2311.09735"
license: reference
domain: [5]
ingest: reference
---

# Authoritative tone

Rewriting content to sound more confident and authoritative about the subject. The study reported this as a helpful, positive tactic for improving visibility in generated responses. Its impact was solid though generally below the citation, quotation, and statistics methods.

**Kind:** Tactic · **Standard:** Generative Engine Optimization tactics · **Source:** https://arxiv.org/abs/2311.09735

- **effect:** improves visibility
- **strength:** moderate

## Related
- [[Add-statistics|Add statistics]]

---
id: "geo-tactics:add-quotations"
label: Add quotations
kind: tactic
standard: geo-tactics
standard_title: Generative Engine Optimization tactics
source_url: "https://arxiv.org/abs/2311.09735"
license: reference
domain: [5]
ingest: reference
---

# Add quotations

Inserting relevant quotations from experts or authoritative figures into the content. It was one of the strongest performers in the study, contributing to visibility gains of up to roughly 40 percent. It proved especially effective for explanation, history, and society-oriented queries.

**Kind:** Tactic · **Standard:** Generative Engine Optimization tactics · **Source:** https://arxiv.org/abs/2311.09735

- **effect:** improves visibility
- **strength:** top performer

## Related
- [[Cite-sources|Cite sources]]
- [[Add-statistics|Add statistics]]

---
id: "google-rich-results:speakable"
label: Speakable
kind: rich-result-type
standard: google-rich-results
standard_title: Google-supported structured data (rich result) types
source_url: "https://developers.google.com/search/docs/appearance/structured-data/speakable"
license: reference
domain: [5]
ingest: reference
---

# Speakable

Marks the sections of a news article best suited to being read aloud by text-to-speech assistants. It helps voice devices select concise, spoken-friendly passages. Currently a beta feature limited mainly to news content in supported languages.

**Kind:** Rich Result Type · **Standard:** Google-supported structured data (rich result) types · **Source:** https://developers.google.com/search/docs/appearance/structured-data/speakable

- **schema:** Speakable

## Related
- [[Article]]

---
id: "schema:ContactPoint"
label: ContactPoint
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/ContactPoint"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [StructuredValue]
---

# ContactPoint

> A contact point—for example, a Customer Complaints department.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/ContactPoint

## Parent types
- [[StructuredValue]]

## Direct subtypes
- [[PostalAddress]]

## Properties (domain includes this type)
- [[areaServed]]
- [[availableLanguage]]
- [[contactOption]]
- [[contactType]]
- [[email]]
- [[faxNumber]]
- [[hoursAvailable]]
- [[productSupported]]
- [[serviceArea]]
- [[telephone]]

---
id: "schema:Service"
label: Service
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/Service"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [Intangible]
---

# Service

> A service provided by an organization, e.g. delivery service, print services, etc.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/Service

## Parent types
- [[Intangible]]

## Direct subtypes
- [[BroadcastService]]
- [[CableOrSatelliteService]]
- [[FinancialProduct]]
- [[FoodService]]
- [[GovernmentService]]
- [[Taxi]]
- [[TaxiService]]
- [[WebAPI]]

## Properties (domain includes this type)
- [[aggregateRating]]
- [[areaServed]]
- [[audience]]
- [[availableChannel]]
- [[award]]
- [[brand]]
- [[broker]]
- [[category]]
- [[hasCertification]]
- [[hasOfferCatalog]]
- [[hoursAvailable]]
- [[isRelatedTo]]
- [[isSimilarTo]]
- [[logo]]
- [[offers]]
- [[produces]]
- [[provider]]
- [[providerMobility]]
- [[review]]
- [[serviceArea]]
- [[serviceAudience]]
- [[serviceOutput]]
- [[serviceType]]
- [[slogan]]
- [[termsOfService]]

---
id: "schema:Offer"
label: Offer
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/Offer"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [Intangible]
---

# Offer

> An offer to transfer some rights to an item or to provide a service — for example, an offer to sell tickets to an event, to rent the DVD of a movie, to stream a TV show over the internet, to repair a motorcycle, or to loan a book.\n\nNote: As the [[businessFunction]] property, which identifies the form of offer (e.g. sell, lease, repair, dispose), defaults to http://purl.org/goodrelations/v1#Sell; an Offer without a defined businessFunction value can be assumed to be an offer to sell.\n\nFor [GTIN](http://www.gs1.org/barcodes/technical/idkeys/gtin)-related fields, see [Check Digit calculator](http://www.gs1.org/barcodes/support/check_digit_calculator) and [validation guide](http://www.gs1us.org/resources/standards/gtin-validation-guide) from [GS1](http://www.gs1.org/).

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/Offer

## Parent types
- [[Intangible]]

## Direct subtypes
- [[AggregateOffer]]
- [[OfferForLease]]
- [[OfferForPurchase]]

## Properties (domain includes this type)
- [[acceptedPaymentMethod]]
- [[addOn]]
- [[additionalProperty]]
- [[advanceBookingRequirement]]
- [[aggregateRating]]
- [[areaServed]]
- [[asin]]
- [[availability]]
- [[availabilityEnds]]
- [[availabilityStarts]]
- [[availableAtOrFrom]]
- [[availableDeliveryMethod]]
- [[businessFunction]]
- [[category]]
- [[checkoutPageURLTemplate]]
- [[deliveryLeadTime]]
- [[eligibleCustomerType]]
- [[eligibleDuration]]
- [[eligibleQuantity]]
- [[eligibleRegion]]
- [[eligibleTransactionVolume]]
- [[gtin]]
- [[gtin12]]
- [[gtin13]]
- [[gtin14]]
- [[gtin8]]
- [[hasAdultConsideration]]
- [[hasGS1DigitalLink]]
- [[hasMeasurement]]
- [[hasMerchantReturnPolicy]]
- [[includesObject]]
- [[ineligibleRegion]]
- [[inventoryLevel]]
- [[isFamilyFriendly]]
- [[itemCondition]]
- [[itemOffered]]
- [[leaseLength]]
- [[mobileUrl]]
- [[mpn]]
- [[offeredBy]]
- [[price]]
- [[priceCurrency]]
- [[priceSpecification]]
- [[priceValidUntil]]
- [[review]]
- [[reviews]]
- [[seller]]
- [[serialNumber]]
- [[shippingDetails]]
- [[sku]]
- [[validForMemberTier]]
- [[validFrom]]
- [[validThrough]]
- [[warranty]]

---
id: "schema:SearchAction"
label: SearchAction
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/SearchAction"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [Action]
---

# SearchAction

> The act of searching for an object.\n\nRelated actions:\n\n* [[FindAction]]: SearchAction generally leads to a FindAction, but not necessarily.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/SearchAction

## Parent types
- [[Action]]

## Properties (domain includes this type)
- [[query]]

---
id: "schema:ImageObject"
label: ImageObject
kind: type
standard: schema-org
standard_title: Schema.org
standard_version: 30.0
source_url: "https://schema.org/ImageObject"
license: CC-BY-SA-3.0
domain: [1]
subClassOf: [MediaObject]
---

# ImageObject

> An image file.

**Kind:** Type (`rdfs:Class`) · **Standard:** Schema.org · **Source:** https://schema.org/ImageObject

## Parent types
- [[MediaObject]]

## Direct subtypes
- [[Barcode]]
- [[ImageObjectSnapshot]]

## Properties (domain includes this type)
- [[caption]]
- [[embeddedTextCaption]]
- [[exifData]]
- [[representativeOfPage]]

---
id: "vpat:conformance-levels"
label: Conformance levels
kind: section
standard: vpat
standard_title: VPAT / Accessibility Conformance Report
source_url: "https://www.section508.gov/sell/how-to-create-acr-with-vpat/"
license: reference
domain: [3]
ingest: reference
---

# Conformance levels

Each criterion is rated with one of a fixed set of terms: Supports when at least one method meets it without known defects, Partially Supports when some functionality does not meet it, and Does Not Support when most functionality fails it. Not Applicable marks criteria irrelevant to the product, while Not Evaluated may be used only for the WCAG Level AAA table. Every rating is paired with a remarks and explanations column giving the supporting detail.

**Kind:** Section · **Standard:** VPAT / Accessibility Conformance Report · **Source:** https://www.section508.gov/sell/how-to-create-acr-with-vpat/

- **part:** terms

## Related
- [[Report-introduction|Report introduction]]
- [[Perceivable-table|Perceivable table]]

---
id: "en-301-549:clause-11-software"
label: Clause 11 Software
kind: clause
standard: en-301-549
standard_title: EN 301 549
source_url: "https://www.etsi.org/deliver/etsi_en/301500_301599/301549/03.02.01_60/en_301549v030201p.pdf"
license: reference
domain: [3]
ingest: reference
---

# Clause 11 Software

Applies WCAG-derived success criteria to non-web software and adds software-specific requirements for interoperability with assistive technology and user preferences. It covers desktop and mobile applications. Exposing accessibility information to platform services is a key theme.

**Kind:** Clause · **Standard:** EN 301 549 · **Source:** https://www.etsi.org/deliver/etsi_en/301500_301599/301549/03.02.01_60/en_301549v030201p.pdf

- **clause:** 11

## Related
- [[Clause-9-Web|Clause 9 Web]]
- [[Clause-10-Non-web-documents|Clause 10 Non-web documents]]

---
id: "section-508:chapter-5-software"
label: Chapter 5 software
kind: provision
standard: section-508
standard_title: Revised Section 508 Standards
source_url: "https://www.access-board.gov/ict/#chapter-5-software"
license: US-Gov-PublicDomain
domain: [3]
ingest: reference
---

# Chapter 5 software

Sets technical requirements for software, including interoperability with assistive technology and support for platform accessibility services. It covers applications and authoring tools. Non-web software also draws on WCAG 2.0 success criteria applied to software.

**Kind:** Provision · **Standard:** Revised Section 508 Standards · **Source:** https://www.access-board.gov/ict/#chapter-5-software

- **chapter:** 5

## Related
- [[Chapter-4-hardware|Chapter 4 hardware]]
- [[WCAG-2.0-incorporation|WCAG 2.0 incorporation]]

---
id: "c2pa:content-credentials"
label: Content Credentials
kind: concept
standard: c2pa
standard_title: C2PA Content Provenance
source_url: "https://contentcredentials.org/"
license: reference
domain: [10]
ingest: reference
---

# Content Credentials

Content Credentials is the user-facing brand and presentation layer for C2PA provenance data, shown through a recognizable icon and detail panel. It lets people inspect who made a piece of media and how it was altered. The name and its symbol give the technical standard a consistent public identity.

**Kind:** Concept · **Standard:** C2PA Content Provenance · **Source:** https://contentcredentials.org/

- **category:** presentation

## Related
- [[Manifest]]

---
id: "c2pa:assertion"
label: Assertion
kind: concept
standard: c2pa
standard_title: C2PA Content Provenance
source_url: "https://c2pa.org/specifications/specifications/2.1/specs/C2PA_Specification.html"
license: reference
domain: [10]
ingest: reference
---

# Assertion

An assertion is an individual statement about the content, such as who created it, what edits were applied, or which capture device was used. Assertions are the granular building blocks of provenance that a claim collects and signs. Each one describes a specific fact about the asset.

**Kind:** Concept · **Standard:** C2PA Content Provenance · **Source:** https://c2pa.org/specifications/specifications/2.1/specs/C2PA_Specification.html

- **category:** structure

## Related
- [[Claim]]
- [[Ingredient]]

---
id: "iptc-photo-metadata:creator"
label: Creator
kind: property
standard: iptc-photo-metadata
standard_title: IPTC Photo Metadata Standard
source_url: "https://www.iptc.org/std/photometadata/documentation/userguide/"
license: reference
domain: [10]
ingest: reference
---

# Creator

The Creator property identifies the person or organization that made the image, such as the photographer or illustrator. It is the primary attribution field for authorship and underpins credit and rights management. Multiple creators can be listed where a work has more than one author.

**Kind:** Property · **Standard:** IPTC Photo Metadata Standard · **Source:** https://www.iptc.org/std/photometadata/documentation/userguide/

- **type:** property

## Related
- [[Credit-Line|Credit Line]]
- [[Copyright-Notice|Copyright Notice]]

---
id: "iptc-photo-metadata:credit-line"
label: Credit Line
kind: property
standard: iptc-photo-metadata
standard_title: IPTC Photo Metadata Standard
source_url: "https://www.iptc.org/std/photometadata/documentation/userguide/"
license: reference
domain: [10]
ingest: reference
---

# Credit Line

The Credit Line is a short, free-text acknowledgement of how the image should be credited when published, for example an agency or photographer byline. It reflects contractual or editorial credit requirements rather than legal ownership. Publishers typically reproduce it verbatim alongside the image.

**Kind:** Property · **Standard:** IPTC Photo Metadata Standard · **Source:** https://www.iptc.org/std/photometadata/documentation/userguide/

- **type:** property

## Related
- [[Creator]]
- [[Copyright-Notice|Copyright Notice]]

---
id: "iptc-photo-metadata:copyright-notice"
label: Copyright Notice
kind: property
standard: iptc-photo-metadata
standard_title: IPTC Photo Metadata Standard
source_url: "https://www.iptc.org/std/photometadata/documentation/userguide/"
license: reference
domain: [10]
ingest: reference
---

# Copyright Notice

The Copyright Notice is a free-text statement asserting the copyright status and owner of the image, often including a year and rights-holder name. It communicates the legal claim over the work to anyone inspecting the file. It complements, rather than replaces, machine-readable rights fields.

**Kind:** Property · **Standard:** IPTC Photo Metadata Standard · **Source:** https://www.iptc.org/std/photometadata/documentation/userguide/

- **type:** property

## Related
- [[Web-Statement-of-Rights|Web Statement of Rights]]
- [[Licensor]]

---
id: "iptc-photo-metadata:description"
label: Description (Caption)
kind: property
standard: iptc-photo-metadata
standard_title: IPTC Photo Metadata Standard
source_url: "https://www.iptc.org/std/photometadata/documentation/userguide/"
license: reference
domain: [10]
ingest: reference
---

# Description (Caption)

The Description, historically called the caption, is a textual account of what the image depicts, including the who, what, when, and where. It supports search, accessibility, and editorial reuse of the image. It is one of the most widely populated descriptive fields in the standard.

**Kind:** Property · **Standard:** IPTC Photo Metadata Standard · **Source:** https://www.iptc.org/std/photometadata/documentation/userguide/

- **type:** property

## Related
- [[Headline]]
- [[Keywords]]

---
id: "core-web-vitals:inp"
label: Interaction to Next Paint (INP)
kind: metric
standard: core-web-vitals
standard_title: "Core Web Vitals & Web Vitals metrics"
source_url: "https://web.dev/articles/inp"
license: reference
domain: [4]
ingest: reference
---

# Interaction to Next Paint (INP)

INP observes every tap, click, and key press across the whole page visit and reports a value near the worst latency between the interaction and the next frame painted in response. It is the Core Web Vital for overall responsiveness, having replaced First Input Delay in 2024. High INP points to long JavaScript tasks blocking the main thread.

**Kind:** Metric · **Standard:** Core Web Vitals & Web Vitals metrics · **Source:** https://web.dev/articles/inp

- **good:** <200ms
- **needs_improvement:** 200ms-500ms
- **poor:** >500ms
- **measures:** interactivity / responsiveness
- **type:** core

## Related
- [[Total-Blocking-Time-TBT|Total Blocking Time (TBT)]]

---
id: "lighthouse:unused-javascript"
label: Reduce unused JavaScript
kind: audit
standard: lighthouse
standard_title: Lighthouse audits
source_url: "https://github.com/GoogleChrome/lighthouse/blob/main/core/audits/byte-efficiency/unused-javascript.js"
license: Apache-2.0
domain: [4]
ingest: full
category: performance
---

# Reduce unused JavaScript

> Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).

**Kind:** Audit · **Standard:** Lighthouse audits · **Category:** performance · **Audit id:** `unused-javascript`

---
id: "readability-formulas:ari"
label: Automated Readability Index (ARI)
kind: formula
standard: readability-formulas
standard_title: Readability Formulas
source_url: "https://en.wikipedia.org/wiki/Automated_readability_index"
license: PublicDomain
domain: [7]
ingest: reference
---

# Automated Readability Index (ARI)

Produces a grade level from characters per word and words per sentence, again sidestepping syllable counting. Designed for real-time machine scoring on typewriters, it responds directly to the character count of the text. Its output maps to a US grade rather than an age band.

**Kind:** Formula · **Standard:** Readability Formulas · **Source:** https://en.wikipedia.org/wiki/Automated_readability_index

- **formula:** 4.71 x (characters/words) + 0.5 x (words/sentences) - 21.43
- **inputs:** characters, words, sentences
- **output:** US grade level

## Related
- [[Coleman-Liau-Index|Coleman-Liau Index]]