chromium/content/test/data/accessibility/css/alt-text.html

<style>
#controlparent::before {
  content:  "item1" "item2" url(bullet.png);
}
</style>

<div id="controlparent">
  <span id="controlchild">Some Text</span>
</div>

<style>
#parent::before {
  content:  "\25BA" / "code";
}
</style>
<div id="parent">
  <span id="child">Some Text</span>
</div>

<style>
#parentempty::before {
  content:  "\25BA" / "";
}
</style>

<div id="parentempty">
  <span id="childempty">Some Text</span>
</div>

<style>
#imgparent::before {
  content: url(bullet.png) / "star";
}
</style>

<div id="imgparent"class="title">
  <span id="imgchild">Some Text</span>
</div>

<style>
#imgparentempty::before {
  content: url(bullet.png) / "";
}
</style>

<div id="imgparentempty"class="title">
  <span id="imgchildempty">Some Text</span>
</div>

<style>
#divlistparent::before {
  content: "item1" "item2" url(bullet.png) / "a list of items";
}
</style>

<div id="divlistparent" class="title">
  <span id="divlistchild">Some Text</span>
</div>

<style>
#emptylistparent::before {
  content: url(bullet.png) "item1" "item2" url(bullet.png) / "";
}
</style>

<div id="emptylistparent" class="title">
  <span id="emptylistchild">Some Text</span>
</div>

<style>
#firstletterchild::first-letter {
  color: red;
  content: "Foo" / "Bar";
}
</style>

<div id="firstletterparent">
  <p id="firstletterchild">Some Text</p>
</div>

<style>
#divcontent {
  content: url(bullet.png) / "alt";
}
</style>

<div id="divcontent">Div text content</div>

<!--- The following test cases are merely here to test that the addition of alt
text support has not altered the default behaviour if the content property is
incorrectly supplied -->

<style>
#divdoubleimage {
  content: url(bullet.png) url(bullet.png) / "alt";
}
</style>

<div id="divdoubleimage">DOM Text</div>

<style>
#divtextcontent {
  content: "text content replacement" / "alt";
}
</style>

<div id="divtextcontent">DOM Text</div>