Accessible images

Images must have text alternatives that describe the information or function represented by them.

Short Text Equivalents for Images

When using the <image> element, specify a short alternative text with the <alt> element.

<image href="puffin.jpg">
  <alt>Puffin figure</alt>
</image>

Long Descriptions of Images

For complex images, when a short text equivalent does not suffice to adequately convey the function or role of an image, provide additional information in a file designated by the <longdescref> element.

<image href="puffin.jpg">
  <alt>Puffin figure</alt>
  <longdescref href="http://www.example.org/birds/puffin.html"
               scope="external"
               format="html"/>
</image>