2d.text.measure.fontBoundingBox-zero-descent.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/text/2d.text.measure.fontBoundingBox-zero-descent.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.fontBoundingBox-zero-descent</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-descent0;

  src: url("/fonts/CanvasTest-descent0.ttf");

</style>

<body class="show_output">

<h1>2d.text.measure.fontBoundingBox-zero-descent</h1>

<p class="desc">Testing fontBoundingBox for OffscreenCanvas with zero descent metric</p>

<span style="font-family: CanvasTest-descent0; 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-descent0';

  ctx.direction = 'ltr';

  ctx.align = 'left'

  _assertSame(ctx.measureText('A').fontBoundingBoxAscent, 30, "ctx.measureText('A').fontBoundingBoxAscent", "30");

  _assertSame(ctx.measureText('A').fontBoundingBoxDescent, 0, "ctx.measureText('A').fontBoundingBoxDescent", "0");

  _assertSame(ctx.measureText('ABCD').fontBoundingBoxAscent, 30, "ctx.measureText('ABCD').fontBoundingBoxAscent", "30");

  _assertSame(ctx.measureText('ABCD').fontBoundingBoxDescent, 0, "ctx.measureText('ABCD').fontBoundingBoxDescent", "0");

}, "Testing fontBoundingBox for OffscreenCanvas with zero descent metric");

</script>