testing/web-platform/tests/html/semantics/forms/attributes-common-to-form-controls/resources/dirname.js


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function onIframeLoadedDone(t, cb, selector="iframe") {
  const iframe = document.querySelector(selector);
  iframe.addEventListener("load", function() {
    // The initial about:blank load event can be fired before the form navigation occurs.
    // See https://github.com/whatwg/html/issues/490 for more information.
    if(iframe.contentWindow.location.href == "about:blank") { return; }

    const params = new URLSearchParams(iframe.contentWindow.location.search);
    t.step(() => cb(params))
    t.done();
  });
}