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Preview of https://hg.mozilla.org/mozilla-central/raw-file/tip/testing/web-platform/tests/css/css-masking/clip-path-svg-content/clip-path-dom-clippathunits.svg
<g id="testmeta">
<title>CSS Masking: Dynamic change of clipPathUnits on clipPath</title>
<html:link rel="author" title="Dirk Schulze" href="mailto:dschulze@adobe.com"/>
<html:link rel="match" href="reference/clip-path-square-003-ref.svg" />
<metadata class="flags">svg</metadata>
<desc class="assert">The clipPathUnits attribute on the clipPath
element gets changed dynamically from objectBoundingBox to userSpaceOnUse.
This reduces the clipping area from a size much bigger than the document to
the size of the green rectangle. A green square should be visible.</desc>
</g>
<clipPath id="clip1" clipPathUnits="objectBoundingBox">
<rect width="200" height="200"/>
</clipPath>
<rect width="400" height="400" fill="red" clip-path="url(#clip1)"/>
<rect width="200" height="200" fill="green"/>
<script>
var clip = document.getElementById("clip1");
var enumeration = clip.clipPathUnits;
enumeration.baseVal = 1; // Switch to userSpaceOnUse!
</script>
</svg>