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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-embed-element/embed-hidden-attribute.html 

<!DOCTYPE html>
<title>The hidden global presentation attribute within the embed element</title>
<link rel="author" href="mailto:[email protected]">
<link rel=match  href="embed-hidden-attribute-ref.html">

This embed should be visible (green box):
<embed src='../../../../images/green-256x256.png' type='image/png'></embed>

These should not be visible (no red):
<embed hidden          src='../../../../images/fail.gif' type='image/png'></embed>
<embed hidden=""       src='../../../../images/fail.gif' type='image/png'></embed>
<embed hidden="hidden" src='../../../../images/fail.gif' type='image/png'></embed>
<embed hidden="true"   src='../../../../images/fail.gif' type='image/png'></embed>
<embed hidden="yes"    src='../../../../images/fail.gif' type='image/png'></embed>

<style>
embed {
  display:block;
}
</style>