gfx/layers/apz/test/mochitest/helper_browser_test_utils.js


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// For hideSelectPopup.
Services.scriptloader.loadSubScript(
  "chrome://mochitests/content/browser/browser/base/content/test/forms/head.js",
  this
);

function openSelectPopup(selector = "select", win = window) {
  let popupShownPromise = BrowserTestUtils.waitForSelectPopupShown(win);
  EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true }, win);
  return popupShownPromise;
}