dynamic-root-element.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-transitions/dynamic-root-element.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1816672">

<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">

<link rel="author" title="Mozilla" href="https://mozilla.org">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<iframe></iframe>

<script>

  let t = async_test("Transitions don't incorrectly start on dynamic document element insertion");

  window.onload = t.step_func_done(function() {

    let frame = document.querySelector("iframe");

    let doc = frame.contentDocument;

    doc.open();

    doc.write("<!doctype html>");

    let root = doc.createElement("html");

    root.innerHTML = `

      <style>

        div {

          width: 100px;

          height: 100px;

          background-color: blue;

          transition: margin-left 10s ease;

          margin-left: 100px;

      </style>

      <div></div>

`;

    doc.appendChild(root);

    doc.close();

    assert_equals(frame.contentWindow.getComputedStyle(doc.querySelector("div")).marginLeft, "100px", "Transition shouldn't have started");

});

</script>