Sajid Anwar
a3e1d680bb
Also adds WPT reftests to validate alignment behavior in horizontal and vertical writing modes with the different `alignment-baseline` values. Additionally: - The `alignment-baseline: middle` tests have failing expectations. This is because the existing implementation does not match the css-inline-3 definition (which the new WPTs follow). See Bug 2030203. - The WidthTest-Regular.otf support font was updated to remove its unusual ideographic-under baseline value, which affected its synthesized central baseline. With the new support for `alignment-baseline: central`, this broke a number of `text-combine-upright-compression-*` WPT reftests. The non-centered baseline values were removed from this test using FontForge, so that the synthesized central baseline matched the expectation of the test references. Differential Revision: https://phabricator.services.mozilla.com/D292136
76 lines
3.9 KiB
HTML
76 lines
3.9 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<link rel="help" href="https://drafts.csswg.org/css-inline-3/#alignment-baseline-property">
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<link rel="stylesheet" href="/fonts/baseline-diagnostic/baseline-diagnostic-font.css">
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<script src="support/variant-class.js"></script>
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<meta name="flags" content="image" />
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<meta charset="utf-8">
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<meta name="variant" content="?class=baseline">
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<meta name="variant" content="?class=text-bottom">
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<meta name="variant" content="?class=alphabetic">
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<meta name="variant" content="?class=ideographic">
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<meta name="variant" content="?class=middle">
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<meta name="variant" content="?class=central">
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<meta name="variant" content="?class=mathematical">
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<meta name="variant" content="?class=hanging">
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<meta name="variant" content="?class=text-top">
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<style>
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:root {
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font: 200px/1 'BaselineDiagnostic';
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}
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#container {
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writing-mode: vertical-rl;
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position: relative;
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}
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#target {
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position: absolute;
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inset-inline-start: 1rem;
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font-size: 0.5rem;
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}
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img {
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position: absolute;
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inset-inline-start: calc(1rem + 0.5rem);
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width: 64px;
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height: 64px;
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--offset-synthesized-under: 64px;
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--offset-synthesized-over: 0px;
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--offset-synthesized-middle: calc((var(--offset-synthesized-under) + var(--offset-synthesized-over)) / 2);
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}
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/* Position the target text span using its font metrics to match baselines */
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.baseline #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-central)); }
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.text-bottom #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-descent)); }
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.alphabetic #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-alphabetic)); }
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.ideographic #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-ideographic-under)); }
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.middle #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-x-middle)); }
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.central #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-central)); }
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.mathematical #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-math)); }
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.hanging #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-hanging)); }
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.text-top #target { inset-block-start: calc((1rem - 0.5rem) * var(--baseline-diagnostic-ascent)); }
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/**
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* Position the image (atomic inline) using its synthesized baselines:
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* - Line-under: text-bottom, alphabetic, ideographic, baseline (in horizontal writing modes)
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* - Midpoint: central, mathematical
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* - Line-over: text-top, hanging
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*/
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.baseline img { inset-block-start: calc(1rem * var(--baseline-diagnostic-central) - var(--offset-synthesized-middle)); }
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.text-bottom img { inset-block-start: calc(1rem * var(--baseline-diagnostic-descent) - var(--offset-synthesized-under)); }
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.alphabetic img { inset-block-start: calc(1rem * var(--baseline-diagnostic-alphabetic) - var(--offset-synthesized-under)); }
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.ideographic img { inset-block-start: calc(1rem * var(--baseline-diagnostic-ideographic-under) - var(--offset-synthesized-under)); }
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.middle img { inset-block-start: calc(1rem * var(--baseline-diagnostic-x-middle) - var(--offset-synthesized-middle)); }
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.central img { inset-block-start: calc(1rem * var(--baseline-diagnostic-central) - var(--offset-synthesized-middle)); }
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.mathematical img { inset-block-start: calc(1rem * var(--baseline-diagnostic-math) - var(--offset-synthesized-middle)); }
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.hanging img { inset-block-start: calc(1rem * var(--baseline-diagnostic-hanging) - var(--offset-synthesized-over)); }
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.text-top img { inset-block-start: calc(1rem * var(--baseline-diagnostic-ascent) - var(--offset-synthesized-over)); }
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</style>
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</head>
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<body>
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<span id="container">X<span id="target">X</span><img src="/images/grgr-256x256.png"></span>
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</body>
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</html> |