2d.text.variationSelectors.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/text/2d.text.variationSelectors.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Canvas text: Variation selectors affect glyph width</title>

<link rel="author" title="Euclid Ye" href="mailto:yezhizhenjiakang@gmail.com">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<link rel="stylesheet" href="/css/css-fonts/support/css/variation-sequences.css">

<link rel="help" href="https://github.com/servo/servo/issues/43650">

<canvas id="canvas" width="400" height="200"></canvas>

<script>

test(() => {

    const canvas = document.getElementById('canvas');

    const ctx = canvas.getContext('2d');

    ctx.font = '32px ColorEmojiFont';

    // Anchor: U+2693

    const base = '\u2693';

    const vs15 = '\uFE0E'; // text selector

    const vs16 = '\uFE0F'; // emoji selector

    const widthText = ctx.measureText(base + vs15).width;

    const widthEmoji = ctx.measureText(base + vs16).width;

    // Emoji should be wider.

    assert_not_equals(widthText, widthEmoji, 'Widths with VS15 and VS16 should differ');

}, 'Variation selectors (VS15/VS16) affect text width');

</script>