forked from mirrors/gecko-dev
65 lines
2.1 KiB
JavaScript
65 lines
2.1 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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"select@chrome://global/content/bindings/textbox.xml",
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"focusAndSelectUrlBar@chrome://browser/content/browser.js",
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"_delayedStartup@chrome://browser/content/browser.js",
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],
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];
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if (Services.appinfo.OS == "Darwin") {
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// TabsInTitlebar._update causes a reflow on OS X trying to do calculations
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// since layout info is already dirty. This doesn't seem to happen before
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// MozAfterPaint on Linux.
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EXPECTED_REFLOWS.push(
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[
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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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"updateAppearance@chrome://browser/content/browser-tabsintitlebar.js",
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"handleEvent@chrome://browser/content/tabbrowser.xml",
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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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"handleEvent@chrome://browser/content/tabbrowser.xml",
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"inferFromText@chrome://browser/content/browser.js",
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"handleEvent@chrome://browser/content/browser.js",
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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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let win = OpenBrowserWindow();
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await withReflowObserver(async function() {
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let resizeEvent = BrowserTestUtils.waitForEvent(win, "resize");
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let delayedStartup =
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TestUtils.topicObserved("browser-delayed-startup-finished",
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subject => subject == win);
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await resizeEvent;
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await delayedStartup;
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}, EXPECTED_REFLOWS, win);
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await BrowserTestUtils.closeWindow(win);
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});
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