# accessibilityHazard - Schema.org Property

> Source: https://schema.org/accessibilityHazard
> Extracted: 2026-02-16T15:05:37.382Z

---

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A characteristic of the described resource that is physiologically dangerous to some users. Related to WCAG 2.0 guideline 2.3. Values should be drawn from the [approved vocabulary](https://www.w3.org/2021/a11y-discov-vocab/latest/#accessibilityHazard-vocabulary).

### Values expected to be one of these types

`-   [Text](https://schema.org/Text "Text")`

### Examples

Example notes or example HTML without markup.

<div>
   <dl>
      <dt>Name:</dt>
      <dd>Holt Physical Science</dd>
      <dt>Brief Synopsis:</dt>
      <dd>NIMAC-sourced textbook</dd>
      <dt>Long Synopsis:</dt>
      <dd>N/A</dd>
      <dt>Book Quality:</dt>
      <dd>Publisher Quality</dd>
      <dt>Book Size:</dt>
      <dd>598 Pages</dd>
      <dt>ISBN-13:</dt>
      <dd>9780030426599</dd>
      <dt>Publisher:</dt>
      <dd >Holt, Rinehart and Winston</dd>
      <dt>Date of Addition:</dt>
      <dd>06/08/10</dd>
      <dt>Copyright Date:</dt>
      <dd>2007</dd>
      <dt>Copyrighted By:</dt>
      <dd>Holt, Rinehart and Winston</dd>
      <dt>Adult content:</dt>
      <dd>No</dd>
      <dt>Language:</dt>
      <dd>English US</dd>
      <dt>Essential Images:</dt>
      <dd>861</dd>
      <dt>Described Images:</dt>
      <dd>910</dd>
      <dt>Categories:</dt>
      <dd>Educational Materials</dd>
      <dt>Grade Levels:</dt>
      <dd>Sixth grade, Seventh grade, Eighth grade</dd>
      <dt>Submitted By:</dt>
      <dd>Bookshare Staff</dd>
      <dt>NIMAC:</dt>
      <dd>This book is currently only available to public K-12 schools and organizations in the
      United States for use with students with an IEP, because it was created from files
      supplied by the NIMAC under these restrictions. Learn more in the NIMAC Support Center.</dd>
   </dl>
   <div class="bookReviews">
      <h2>Reviews of Holt Physical Science (0 reviews)</h2>
      <div class="bookReviewScore">
         <span>0 - No Rating Yet</span>
      </div>
   </div>
</div>

Example encoded as [Microdata](https://en.wikipedia.org/wiki/Microdata_\(HTML\)) embedded in HTML.

<p>
This example shows the addition of Accessibility metadata. Although these properties are not
a formal enumeration, there is evolving consensus amongst accessibility experts for
appropriate values for these properties. This example shows simple text values,
as suggested by www.a11ymetadata.org.
</p>

<div itemscope="" itemtype="https://schema.org/Book">
   <meta itemprop="bookFormat" content="EBook"/>
   <meta itemprop="accessibilityFeature" content="largePrint"/>
   <meta itemprop="accessibilityFeature" content="highContrastDisplay"/>
   <meta itemprop="accessibilityFeature" content="displayTransformability"/>
   <meta itemprop="accessibilityFeature" content="longDescription"/>
   <meta itemprop="accessibilityFeature" content="alternativeText"/>
   <meta itemprop="accessibilityControl" content="fullKeyboardControl"/>
   <meta itemprop="accessibilityControl" content="fullMouseControl"/>
   <meta itemprop="accessibilityHazard" content="noFlashingHazard"/>
   <meta itemprop="accessibilityHazard" content="noMotionSimulationHazard"/>
   <meta itemprop="accessibilityHazard" content="noSoundHazard"/>
   <meta itemprop="accessibilityAPI" content="ARIA"/>

   <dl>
      <dt>Name:</dt>
      <dd itemprop="name">Holt Physical Science</dd>
      <dt>Brief Synopsis:</dt>
      <dd itemprop="description">NIMAC-sourced textbook</dd>
      <dt>Long Synopsis:</dt>
      <dd>N/A</dd>
      <dt>Book Quality:</dt>
      <dd>Publisher Quality</dd>
      <dt>Book Size:</dt>
      <dd><span itemprop="numberOfPages">598</span> Pages</dd>
      <dt>ISBN-13:</dt>
      <dd itemprop="isbn">9780030426599</dd>
      <dt>Publisher:</dt>
      <dd itemprop="publisher" itemtype="https://schema.org/Organization" itemscope=""><span itemprop="name">Holt, Rinehart and Winston</span></dd>
      <dt>Date of Addition:</dt>
      <dd>06/08/10</dd>
      <dt>Copyright Date:</dt>
      <dd itemprop="copyrightYear">2007</dd>
      <dt>Copyrighted By:</dt>
      <dd itemprop="copyrightHolder" itemtype="https://schema.org/Organization" itemscope=""><span itemprop="name">Holt, Rinehart and Winston</span></dd>
      <dt>Adult content:</dt>
      <dd><meta itemprop="isFamilyFriendly" content="true"/>No</dd>
      <dt>Language:</dt>
      <dd><meta itemprop="inLanguage" content="en-US"/>English US</dd>
      <dt>Essential Images:</dt>
      <dd>861</dd>
      <dt>Described Images:</dt>
      <dd>910</dd>
      <dt>Categories:</dt>
      <dd><span itemprop="genre">Educational Materials</span></dd>
      <dt>Grade Levels:</dt>
      <dd>Sixth grade, Seventh grade, Eighth grade</dd>
      <dt>Submitted By:</dt>
      <dd>Bookshare Staff</dd>
      <dt>NIMAC:</dt>
      <dd>This book is currently only available to public K-12 schools and organizations in the
      United States for use with students with an IEP, because it was created from files
      supplied by the NIMAC under these restrictions. Learn more in the NIMAC Support Center.</dd>
   </dl>

   <div class="bookReviews" itemprop="aggregateRating" itemscope itemtype="https://schema.org/AggregateRating">
      <h2>Reviews of Holt Physical Science (<span itemprop="reviewCount">0</span> reviews)</h2>

      <div class="bookReviewScore">
         <span><span itemprop="ratingValue">0</span> - No Rating Yet</span>
      </div>
   </div>
</div>

Example encoded as [RDFa](https://en.wikipedia.org/wiki/RDFa) embedded in HTML.

<p>
This example shows the addition of Accessibility metadata. Although these properties are not
a formal enumeration, there is evolving consensus amongst accessibility experts for
appropriate values for these properties. This example shows simple text values,
as suggested by www.a11ymetadata.org.
</p>

<div vocab="https://schema.org/" typeof="Book">
   <meta property="bookFormat" content="EBook"/>
   <meta property="accessibilityFeature" content="largePrint"/>
   <meta property="accessibilityFeature" content="highContrastDisplay"/>
   <meta property="accessibilityFeature" content="displayTransformability"/>
   <meta property="accessibilityFeature" content="longDescription"/>
   <meta property="accessibilityFeature" content="alternativeText"/>
   <meta property="accessibilityControl" content="fullKeyboardControl"/>
   <meta property="accessibilityControl" content="fullMouseControl"/>
   <meta property="accessibilityHazard" content="noFlashingHazard"/>
   <meta property="accessibilityHazard" content="noMotionSimulationHazard"/>
   <meta property="accessibilityHazard" content="noSoundHazard"/>
   <meta property="accessibilityAPI" content="ARIA"/>

   <dl>
      <dt>Name:</dt>
      <dd property="name">Holt Physical Science</dd>
      <dt>Brief Synopsis:</dt>
      <dd property="description">NIMAC-sourced textbook</dd>
      <dt>Long Synopsis:</dt>
      <dd>N/A</dd>
      <dt>Book Quality:</dt>
      <dd>Publisher Quality</dd>
      <dt>Book Size:</dt>
      <dd><span property="numberOfPages">598</span> Pages</dd>
      <dt>ISBN-13:</dt>
      <dd property="isbn">9780030426599</dd>
      <dt>Publisher:</dt>
      <dd property="publisher" typeof="Organization"><span property="name">Holt, Rinehart and Winston</span></dd>
      <dt>Date of Addition:</dt>
      <dd>06/08/10</dd>
      <dt>Copyright Date:</dt>
      <dd property="copyrightYear">2007</dd>
      <dt>Copyrighted By:</dt>
      <dd property="copyrightHolder" typeof="Organization"><span property="name">Holt, Rinehart and Winston</span></dd>
      <dt>Adult content:</dt>
      <dd><meta property="isFamilyFriendly" content="true"/>No</dd>
      <dt>Language:</dt>
      <dd><meta property="inLanguage" content="en-US"/>English US</dd>
      <dt>Essential Images:</dt>
      <dd>861</dd>
      <dt>Described Images:</dt>
      <dd>910</dd>
      <dt>Categories:</dt>
      <dd><span property="genre">Educational Materials</span></dd>
      <dt>Grade Levels:</dt>
      <dd>Sixth grade, Seventh grade, Eighth grade</dd>
      <dt>Submitted By:</dt>
      <dd>Bookshare Staff</dd>
      <dt>NIMAC:</dt>
      <dd>This book is currently only available to public K-12 schools and organizations in the
      United States for use with students with an IEP, because it was created from files
      supplied by the NIMAC under these restrictions. Learn more in the NIMAC Support Center.</dd>
   </dl>

   <div class="bookReviews" property="aggregateRating" typeof="AggregateRating">
      <h2>Reviews of Holt Physical Science (<span property="reviewCount">0</span> reviews)</h2>

      <div class="bookReviewScore">
         <span><span property="ratingValue">0</span> - No Rating Yet</span>
      </div>
   </div>
</div>

Example encoded as [JSON-LD](https://en.wikipedia.org/wiki/JSON-LD) in a HTML script tag.

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Book",
  "accessibilityAPI": "ARIA",
  "accessibilityControl": \[
    "fullKeyboardControl",
    "fullMouseControl"
  \],
  "accessibilityFeature": \[
    "largePrint",
    "highContrastDisplay",
    "displayTransformability",
    "longDescription",
    "alternativeText"
  \],
  "accessibilityHazard": \[
    "noFlashingHazard",
    "noMotionSimulationHazard",
    "noSoundHazard"
  \],
  "aggregateRating": {
    "@type": "AggregateRating",
    "reviewCount": "0"
  },
  "bookFormat": "EBook",
  "copyrightHolder": {
    "@type": "Organization",
    "name": "Holt, Rinehart and Winston"
  },
  "copyrightYear": "2007",
  "description": "NIMAC-sourced textbook",
  "genre": "Educational Materials",
  "inLanguage": "en-US",
  "isFamilyFriendly": "true",
  "isbn": "9780030426599",
  "name": "Holt Physical Science",
  "numberOfPages": "598",
  "publisher": {
    "@type": "Organization",
    "name": "Holt, Rinehart and Winston"
  }
}
</script>

Structured representation of the JSON-LD example.

Example notes or example HTML without markup.

<img src="png"
  alt="standards. toothbrushes. don't ask" longdesc="927desc.html">

Example encoded as [Microdata](https://en.wikipedia.org/wiki/Microdata_\(HTML\)) embedded in HTML.

<figure itemscope itemtype="https://schema.org/CreativeWork">
 <meta itemprop="accessibilityFeature" content="alternativeText">
 <meta itemprop="accessibilityFeature" content="longDescription">
 <meta itemprop="accessibilityHazard" content="noFlashingHazard">
 <meta itemprop="accessibilityHazard" content="noMotionSimulationHazard">
 <meta itemprop="encodingFormat" content="image/png">
<img src="png"
  alt="standards. toothbrushes. don't ask" longdesc="927desc.html">
</figure>

Example encoded as [RDFa](https://en.wikipedia.org/wiki/RDFa) embedded in HTML.

<figure vocab="https://schema.org/" typeof="CreativeWork">
 <meta property="accessibilityFeature" content="alternativeText">
 <meta property="accessibilityFeature" content="longDescription">
 <meta property="accessibilityHazard" content="noFlashingHazard">
 <meta property="accessibilityHazard" content="noMotionSimulationHazard">
 <meta property="encodingFormat" content="image/png">
<img src="png"
  alt="standards. toothbrushes. don't ask" longdesc="927desc.html">
</figure>

Example notes or example HTML without markup.

\[A basic presentation in HTML\]

Example encoded as [Microdata](https://en.wikipedia.org/wiki/Microdata_\(HTML\)) embedded in HTML.

<main itemscope itemtype="https://schema.org/CreativeWork">
   <meta itemprop="accessibilityHazard" content="flashing"/>
   <meta itemprop="accessibilityHazard" content="noMotionSimulationHazard"/>
   <meta itemprop="accessibilityHazard" content="noSoundHazard"/>
   <meta itemprop="accessibilityFeature" content="longDescription"/>
   <meta itemprop="accessibilityFeature" content="alternativeText"/>
   <meta itemprop="encodingFormat" content="text/html"/>
   <meta itemprop="encodingFormat" content="image/png"/>
   <meta itemprop="encodingFormat" content="text/css"/>
   <meta itemprop="encodingFormat" content="text/javascript"/>
   <meta itemprop="accessibilityAPI" content="ARIA"/>
   <meta itemprop="accessibilityAPI" content="UIAccessibility"/>
   <meta itemprop="accessibilityControl" content="fullKeyboardControl"/>
   <meta itemprop="accessibilityControl" content="fullKeyboardControl"/>
   <meta itemprop="accessibilityControl" content="fullKeyboardControl"/>
   <meta itemprop="accessibilityControl" content="fullMouseControl"/>
 <!--...slide content...-->
</main>

Example encoded as [RDFa](https://en.wikipedia.org/wiki/RDFa) embedded in HTML.

<div vocab="https://schema.org/" typeof="CreativeWork">
   <meta property="accessibilityHazard" content="flashing"/>
   <meta property="accessibilityHazard" content="noMotionSimulationHazard"/>
   <meta property="accessibilityHazard" content="noSoundHazard"/>
   <meta property="accessibilityFeature" content="longDescription"/>
   <meta property="accessibilityFeature" content="alternativeText"/>
   <meta property="encodingFormat" content="text/html"/>
   <meta property="encodingFormat" content="image/png"/>
   <meta property="encodingFormat" content="text/css"/>
   <meta property="encodingFormat" content="text/javascript"/>
   <meta property="accessibilityAPI" content="ARIA"/>
   <meta property="accessibilityAPI" content="UIAccessibility"/>
   <meta property="accessibilityControl" content="fullKeyboardControl"/>
   <meta property="accessibilityControl" content="fullKeyboardControl"/>
   <meta property="accessibilityControl" content="fullKeyboardControl"/>
   <meta property="accessibilityControl" content="fullMouseControl"/>
 <!--...slide content...-->
</div>

Example encoded as [JSON-LD](https://en.wikipedia.org/wiki/JSON-LD) in a HTML script tag.

<script type="application/ld+json"> {
 "@context" :  "https://schema.org/" ,
 "@type" : "CreativeWork" ,
 "accessibilityHazard" :  \[
        "flashing" , "noSoundHazard" ,
        "noMotionSimulationHazard" \] ,

 "accessibilityFeature" : \[
        "alternativeText" , "longDescription" \] ,

 "encodingFormat" : \[
        "text/html" , "image/png" ,
        "text/javascript" , "text/css" \] ,

 "accessibilityAPI" : \[
        "ARIA" , "UIAccessibility" \],
 "accessibilityControl" : \[
        "fullKeyboardControl" , "fullTouchControl" ,
        "fullVoiceControl" , "fullMouseControl" \]
} </script>

Structured representation of the JSON-LD example.