testing/web-platform/tests/css/css-highlight-api/painting/custom-highlight-painting-below-selection-transparency-ref.html


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<!DOCTYPE html>
<meta charset="UTF-8">
<style>
  #highlighted {
    background: yellow;
  }
</style>

<body><span id="highlighted">This should be yellow, <span id="selected">this should mix with the
      selection,</span></span> this should have no background.
  <script>
    getSelection().setBaseAndExtent(selected, 0, selected, 1);
  </script>