forked from mirrors/gecko-dev
5f9f0cd7f2
MozReview-Commit-ID: 5ZL5RtItbiL --HG-- extra : rebase_source : 93fbacfde3a9825e46c0d81bb3ad29af448551fa extra : source : 7629e34f7fb6f756c09f0d6735b746a9d1050c5f
44 lines
1.5 KiB
JavaScript
44 lines
1.5 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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// selection change notification may cause querying the focused editor content
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// by IME and that will cause reflow.
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{
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stack: [
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"select@chrome://global/content/bindings/textbox.xml",
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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 tabs.
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*/
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add_task(async function() {
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await ensureNoPreloadedBrowser();
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// Add a reflow observer and open a new tab.
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await withReflowObserver(async function() {
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let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
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BrowserOpenTab();
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await BrowserTestUtils.waitForEvent(gBrowser.selectedTab, "transitionend",
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false, e => e.propertyName === "max-width");
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await switchDone;
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}, EXPECTED_REFLOWS);
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let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
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await BrowserTestUtils.removeTab(gBrowser.selectedTab);
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await switchDone;
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});
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