File: custom-highlight-painting-iframe-002.html

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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Highlight API Test: </title>
<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
<link rel="match" href="custom-highlight-painting-iframe-001-ref.html">
<meta name="assert" value="Creating a Highlight in the root Document and registering it in an iframe's CSS.highlights is painted correctly.">
<body>
  <iframe
    id="iframe"
    srcdoc="
    <style>
      ::highlight(foo) {
        color: blue;
        background-color: cyan;
      }
    </style>
    <span id='span-iframe'>abc</span>
    "
    >
</iframe>
<script>
  let iframe = document.querySelector("#iframe");
  iframe.onload = () => {
    let spanIframe = iframe.contentDocument.querySelector("#span-iframe");
    let rangeIframe = new Range();
    rangeIframe.setStart(spanIframe, 0);
    rangeIframe.setEnd(spanIframe, 1);

    let h = new Highlight();
    h.add(rangeIframe);
    iframe.contentWindow.CSS.highlights.set("foo", h);
  }
</script>