opacity-squashed-owner.html | Explore in Territory

<!DOCTYPE html>
<style>
  .set {
    position: absolute;
    top: 8px;
  }
  .box {
    height: 100px;
    width: 100px;
    background-color: lightblue;
  }
  .squashed {
    height: 40px;
    width: 40px;
    background-color: lightgreen;
    position: absolute;
    left: 16px;
  }
  .composited {
    will-change: transform;
  }
  .opaque {
    opacity: 0.5;
  }
</style>
<!-- This test checks that setting the opacity of the owner of a squashed layer only affects that layer, and not the squashed layers. -->

<!-- This div will be the "owner" of the squashing layer -->
<div id="target" class="composited box"></div>
<!-- These divs will be squashed into a layer containing them and the owner -->
<div class="squashed" style="top: 4px"></div>
<div class="squashed" style="top: 54px"></div>
<pre id="layers">Layer tree goes here in DRT</pre>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    document.getElementById("target").classList.add("opaque");

    var layersResult = document.getElementById('layers');
    if (window.testRunner)
        layersResult.innerText = internals.layerTreeAsText(document);
</script>

chromium/third_party/blink/web_tests/compositing/squashing/opacity-squashed-owner.html