forked from mirrors/gecko-dev
71 lines
2.4 KiB
JavaScript
71 lines
2.4 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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"use strict";
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/**
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* WHOA THERE: We should never be adding new things to EXPECTED_REFLOWS. This
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* is a whitelist that should slowly go away as we improve the performance of
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* the front-end. Instead of adding more reflows to the whitelist, you should
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* be modifying your code to avoid the reflow.
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*
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* See https://developer.mozilla.org/en-US/Firefox/Performance_best_practices_for_Firefox_fe_engineers
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* for tips on how to do that.
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*/
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const EXPECTED_REFLOWS = [
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/**
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* Nothing here! Please don't add anything new!
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*/
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];
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if (Services.appinfo.OS == "WINNT") {
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EXPECTED_REFLOWS.push(
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{
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stack: [
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"verticalMargins@chrome://browser/content/browser-tabsintitlebar.js",
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"_update@chrome://browser/content/browser-tabsintitlebar.js",
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"onDOMContentLoaded@chrome://browser/content/browser-tabsintitlebar.js",
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"onDOMContentLoaded@chrome://browser/content/browser.js",
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],
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maxCount: 2, // This number should only ever go down - never up.
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},
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);
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}
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if (Services.appinfo.OS == "WINNT" || Services.appinfo.OS == "Darwin") {
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EXPECTED_REFLOWS.push(
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{
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stack: [
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"rect@chrome://browser/content/browser-tabsintitlebar.js",
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"_update@chrome://browser/content/browser-tabsintitlebar.js",
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"onDOMContentLoaded@chrome://browser/content/browser-tabsintitlebar.js",
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"onDOMContentLoaded@chrome://browser/content/browser.js",
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],
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// These numbers should only ever go down - never up.
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maxCount: Services.appinfo.OS == "WINNT" ? 5 : 4,
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},
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);
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}
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/*
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* This test ensures that there are no unexpected
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* uninterruptible reflows when opening new windows.
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*/
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add_task(async function() {
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// Flushing all caches helps to ensure that we get consistent
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// behaviour when opening a new window, even if windows have been
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// opened in previous tests.
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Services.obs.notifyObservers(null, "startupcache-invalidate");
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Services.obs.notifyObservers(null, "chrome-flush-skin-caches");
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Services.obs.notifyObservers(null, "chrome-flush-caches");
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let win = OpenBrowserWindow();
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await withReflowObserver(async function() {
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await TestUtils.topicObserved("browser-delayed-startup-finished",
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subject => subject == win);
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}, EXPECTED_REFLOWS, win);
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await BrowserTestUtils.closeWindow(win);
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});
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