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chromium/content/test/data/accessibility/html/picture.html 

<!--
@MAC-ALLOW:AXRoleDescription='image'
@WIN-ALLOW:xml-roles:*
-->
<html>
  <body>
    <picture>
      <source sizes="100vw" srcset="./200.webp 200w,./400.webp 400w"
        type="image/webp" />
      <img src="./200.jpg" width="200" height="200" alt="x"
        sizes="100vw" srcset="./200.jpg 200w,./400.jpg 400w" />
    </picture>
    <picture>
      <source sizes="100vw" srcset="./200.webp 200w,./400.webp 400w"
        type="image/webp" />
      <img src="./200.jpg" width="200" height="200" alt=" "
        sizes="100vw" srcset="./200.jpg 200w,./400.jpg 400w" />
    </picture>
    <picture>
      <source sizes="100vw" srcset="./200.webp 200w,./400.webp 400w"
        type="image/webp" />
      <img src="./200.jpg" width="200" height="200" alt=""
        sizes="100vw" srcset="./200.jpg 200w,./400.jpg 400w" />
    </picture>
    <picture>
      <source sizes="100vw" srcset="./200.webp 200w,./400.webp 400w"
        type="image/webp" />
      <img src="./200.jpg" width="200" height="200" alt
        sizes="100vw" srcset="./200.jpg 200w,./400.jpg 400w" />
    </picture>
    <picture>
      <source sizes="100vw" srcset="./200.webp 200w,./400.webp 400w"
        type="image/webp" />
      <img src="./200.jpg" width="200" height="200"
        sizes="100vw" srcset="./200.jpg 200w,./400.jpg 400w" />
    </picture>
  </body>
</html>