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chromium/third_party/blink/web_tests/external/wpt/css/css-cascade/revert-layer-003.html 

<!DOCTYPE html>
<title>CSS Cascade Layers: 'all: revert-layer'</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#revert-layer">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="reference/ref-filled-green-100px-square.xht">

<style>
@layer {
  #target {
    width: 100px;
    height: 100px;
    background-color: green;
  }
}

@layer {
  #target {
    width: 200px;
    height: 200px;
    background-color: red;
  }

  #target {
    all: revert-layer;
  }
}
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="target"></div>