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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-url-tests.js 

const loadPromise = new Promise(resolve => { window.resolveLoadPromise = resolve; });

function assertURL(doc) {
  assert_equals(doc.URL, "about:blank", "document.URL");
  assert_equals(doc.documentURI, "about:blank", "document.documentURI");
  assert_equals(doc.baseURI, "about:blank", "document.baseURI");
}

const inputs = {
  valid: "<html></html>",
  "invalid XML": `<span x:test="testing">1</span>`
};

for (const [inputName, input] of Object.entries(inputs)) {
  test(() => {
    const doc = Document.parseHTMLUnsafe(input);

    assertURL(doc);
  }, `${inputName}: created normally`);

  promise_test(async () => {
    await loadPromise;

    const doc = frames[0].Document.parseHTMLUnsafe(input);

    assertURL(doc);
  }, `${inputName}: created using another iframe's parseHTMLUnsafe from this frame`);

  promise_test(async () => {
    await loadPromise;

    const doc = frames[0].doParse(input);

    assertURL(doc);
  }, `${inputName}: created using another iframe's parseHTMLUnsafe from that frame`);
}