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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/text/2d.text.measure.emHeights.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<meta charset="UTF-8">
<title>Canvas test: 2d.text.measure.emHeights</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<style>
@font-face {
font-family: CanvasTest;
src: url("/fonts/CanvasTest.ttf");
}
</style>
<body class="show_output">
<h1>2d.text.measure.emHeights</h1>
<p class="desc">Testing emHeights</p>
<span style="font-family: CanvasTest; position: absolute; visibility: hidden">A</span>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<ul id="d"></ul>
<script>
promise_test(async t => {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
await document.fonts.ready;
ctx.font = '40px CanvasTest';
ctx.direction = 'ltr';
ctx.align = 'left'
_assertSame(ctx.measureText('A').emHeightAscent, 30, "ctx.measureText('A').emHeightAscent", "30");
_assertSame(ctx.measureText('A').emHeightDescent, 10, "ctx.measureText('A').emHeightDescent", "10");
_assertSame(ctx.measureText('A').emHeightDescent + ctx.measureText('A').emHeightAscent, 40, "ctx.measureText('A').emHeightDescent + ctx.measureText('A').emHeightAscent", "40");
_assertSame(ctx.measureText('ABCD').emHeightAscent, 30, "ctx.measureText('ABCD').emHeightAscent", "30");
_assertSame(ctx.measureText('ABCD').emHeightDescent, 10, "ctx.measureText('ABCD').emHeightDescent", "10");
_assertSame(ctx.measureText('ABCD').emHeightDescent + ctx.measureText('ABCD').emHeightAscent, 40, "ctx.measureText('ABCD').emHeightDescent + ctx.measureText('ABCD').emHeightAscent", "40");
}, "Testing emHeights");
</script>