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Bug 1611039 [wpt PR 21362] - Add tests of the recalculation of 'ch' in pseudo elements, a=testonly
Automatic update from web-platform-tests Add tests of the recalculation of 'ch' in pseudo elements Length unit 'ch' should be recalculated after loading a web font. This patch is a followup of crrev.com/c/1972815 to ensure that it's also recalculated in pseudo elements. Bug: 441925 Change-Id: Ie62dba854aa9d1beb6b9a734f31760abf1acd040 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016198 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org> Cr-Commit-Position: refs/heads/master@{#734495} -- wpt-commits: 025c749a21b0fd0c9bd758cc33c7ff3e122073de wpt-pr: 21362
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<!DOCTYPE html>
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<meta charset="utf-8">
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<title>Length unit 'ch' used in pseudo elements should be recalculated after loading a web font</title>
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<link rel="help" href="https://www.w3.org/TR/css-values-4/#font-relative-lengths">
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<link rel="help" href="https://drafts.csswg.org/css-pseudo-4">
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<link rel="author" href="xiaochengh@chromium.org">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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.container {
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font: 25px/1 "custom font", monospace;
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}
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.before::before,
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.after::after,
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.first-letter::first-letter,
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.first-line::first-line {
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font-family: monospace;
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font-size: 1ch; /* Refers to originating element's font metrics, which are different from self font metrics. */
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}
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.before::before,
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.after::after {
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content: 'text';
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}
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/* Defined separately so that browsers that haven't shipped it can still pass other tests. */
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.marker::marker {
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font-family: monospace;
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font-size: 1ch;
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content: 'text';
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}
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</style>
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<div class="container before"></div>
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<div class="container after"></div>
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<div class="container first-letter">text</div>
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<div class="container first-line">text</div>
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<li class="container marker"></li>
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<script>
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function parseFontSizeInPx(element, pseudoElement) {
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const value = CSSNumericValue.parse(getComputedStyle(element, pseudoElement).fontSize);
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if (!value || !(value instanceof CSSUnitValue) || value.unit !== 'px')
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throw 'Cannot parse width in pixels';
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return value.value;
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}
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const testCases = ['before', 'after', 'first-letter', 'first-line', 'marker'];
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const elements = testCases.map(testCase => document.querySelector('.' + testCase));
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const asyncTests = testCases.map(
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testCase => async_test(`ch in pseudo-element ::${testCase} should be recalculated after loading a web font`));
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// Before loading custom font, tests should be rendered with monospace
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// fallback and have a '1ch' measurement much shorter than 25px.
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for (let i = 0; i < testCases.length; ++i) {
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asyncTests[i].step(() => {
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const fontSizePx = parseFontSizeInPx(elements[i], '::' + testCases[i]);
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assert_less_than(fontSizePx, 24);
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});
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}
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// Insert custom font into style sheet and load it
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const customFont = new FontFace('custom font', 'url(/fonts/Ahem.ttf)');
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document.fonts.add(customFont);
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// After loading custom font, tests should be rendered with the custom font,
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// which is Ahem, and have a '1ch' measurement that equals 25px.
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customFont.load().then(
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() => {
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for (let i = 0; i < testCases.length; ++i) {
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asyncTests[i].step(() => {
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const fontSizePx = parseFontSizeInPx(elements[i], '::' + testCases[i]);
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assert_approx_equals(fontSizePx, 25, 0.1);
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asyncTests[i].done();
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});
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}
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},
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() => {
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for (let i = 0; i < testCases.length; ++i) {
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asyncTests[i].step(() => {
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assert_unreached('Failed to load font');
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});
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}
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}
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);
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</script>
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