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chromium/third_party/blink/web_tests/external/wpt/svg/scripted/script-runs-in-shadow-tree.html 

<!doctype html>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1555949">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="host"></div>
<script>
  let svgScript = document.createElementNS("http://www.w3.org/2000/svg", "script");
  svgScript.innerHTML = "window.scriptRan = true";
  document.getElementById("host").attachShadow({ mode: "open" }).appendChild(svgScript);
  test(function() {
    assert_true(window.scriptRan);
  }, "svg:script runs correctly in a shadow tree");
</script>