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3d29b274ae
This is probably an old-ish bug made more frequent by the font loading optimizations. PostRebuildAllStyleData is a bit of a misnomer, but was always calling ClearCachedData() on the style set, even if we weren't guaranteed to restyle every element. This means both wasted work and correctness issues (as the "uses <rare-feature>" bits are cleared during this call, on the assumption that we'll then visit all elements and that'd recompute it properly). For now, unify a bit the different code paths and only clear these bits if we're guaranteed to restyle all elements. I should rename this to something better in a follow-up, and ideally also decouple the ClearCachedData() calls a bit... Differential Revision: https://phabricator.services.mozilla.com/D65740 --HG-- extra : moz-landing-system : lando
43 lines
2 KiB
HTML
43 lines
2 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>CSS Values: Viewport units are computed correctly after font load.</title>
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<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
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<link rel="author" title="Mozilla" href="https://mozilla.org">
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<link rel="help" href="https://drafts.csswg.org/css-values-4/#viewport-relative-lengths">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1620359">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<iframe width=300 height=300 scrolling=no srcdoc=""></iframe>
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<script>
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let t = async_test("Viewport units are correctly updated after resize even if a font load has happened before");
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let iframe = document.querySelector("iframe");
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onload = t.step_func(function() {
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let doc = iframe.contentDocument;
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let win = iframe.contentWindow;
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doc.body.innerHTML = `
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<div style="width: 100vw; height: 100vh; background: green"></div>
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`;
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let div = doc.querySelector("div");
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let oldWidth = win.getComputedStyle(div).width;
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let oldHeight = win.getComputedStyle(div).height;
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assert_equals(oldWidth, win.innerWidth + "px", "Should fill the viewport");
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assert_equals(oldHeight, win.innerHeight + "px", "Should fill the viewport");
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let link = doc.createElement("link");
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link.rel = "stylesheet";
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link.href = "/fonts/ahem.css";
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link.onload = t.step_func(function() {
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iframe.width = 400;
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win.requestAnimationFrame(t.step_func(function() {
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win.requestAnimationFrame(t.step_func_done(function() {
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let newWidth = win.getComputedStyle(div).width;
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let newHeight = win.getComputedStyle(div).height;
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assert_equals(newWidth, win.innerWidth + "px", "Should fill the viewport");
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assert_equals(newHeight, win.innerHeight + "px", "Should fill the viewport");
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assert_equals(newHeight, oldHeight, "Height shouldn't have changed");
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assert_not_equals(newWidth, oldWidth, "Width should have changed");
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}));
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}));
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});
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doc.body.appendChild(link);
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});
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</script>
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