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79 lines
2.3 KiB
HTML
79 lines
2.3 KiB
HTML
<!DOCTYPE html>
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<title>Length unit 'ch' should be recalculated after loading a web font</title>
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<link rel="help" href="https://www.w3.org/TR/css-font-loading-3/#font-face-load">
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<link rel="help" href="https://www.w3.org/TR/css-values-3/#font-relative-lengths">
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<link rel="author" href="mailto: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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.test {
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width: 1ch;
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}
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</style>
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<div class="container">
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<div class="test"></div>
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</div>
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<div class="container" style="display: contents">
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<div class="test"></div>
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</div>
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<div class="container" style="display: none">
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<div class="test"></div>
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</div>
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<script>
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function parseWidthInPx(element) {
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const value = getComputedStyle(element).width;
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if (!value.endsWith('px'))
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return NaN;
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return parseFloat(value);
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}
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const testCases = document.querySelectorAll('.test');
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const asyncTests = [
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async_test('ch in a normal div should be recalculated after loading a web font'),
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async_test('ch in display:contents should be recalculated after loading a web font'),
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async_test('ch in display:none should be recalculated after loading a web font')
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];
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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 widthPx = parseWidthInPx(testCases[i]);
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assert_less_than(widthPx, 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 widthPx = parseWidthInPx(testCases[i]);
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assert_approx_equals(widthPx, 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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