browser_destroying_iframes.js

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Frequent promise rejections which are not impacting the load of the toolbox.

const { PromiseTestUtils } = ChromeUtils.importESModule(

  "resource://testing-common/PromiseTestUtils.sys.mjs"

);

PromiseTestUtils.allowMatchingRejectionsGlobally(/NS_ERROR_FAILURE/);

// Testing that there's no breaking exception when destroying

// an iframe early after its creation.

add_task(async function () {

  const { tab } = await openInspectorForURL("about:blank");

  const browser = tab.linkedBrowser;

  // Create/remove an extra one now, after the load event.

  for (let i = 0; i < 10; i++) {

    await SpecialPowers.spawn(browser, [], async function () {

      const iframe = content.document.createElement("iframe");

      const loaded = new Promise(res => (iframe.onload = res));

      content.document.body.appendChild(iframe);

      await loaded;

      iframe.remove();

});

});