dirname.js - mozsearch

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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();

});