1 files changed, 45 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/element/text/2d.text.measure.emHeights-low-ascent.html b/testing/web-platform/tests/html/canvas/element/text/2d.text.measure.emHeights-low-ascent.html
new file mode 100644
index 0000000000..7b6874d10b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/text/2d.text.measure.emHeights-low-ascent.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.text.measure.emHeights-low-ascent</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-ascent256;
+  src: url("/fonts/CanvasTest-ascent256.ttf");
+}
+</style>
+<body class="show_output">
+
+<h1>2d.text.measure.emHeights-low-ascent</h1>
+<p class="desc">Testing emHeights with reduced ascent metric</p>
+
+
+<span style="font-family: CanvasTest-ascent256; 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-ascent256';
+  ctx.direction = 'ltr';
+  ctx.align = 'left'
+  _assertSame(ctx.measureText('A').emHeightAscent, 20, "ctx.measureText('A').emHeightAscent", "20");
+  _assertSame(ctx.measureText('A').emHeightDescent, 20, "ctx.measureText('A').emHeightDescent", "20");
+  _assertSame(ctx.measureText('A').emHeightDescent + ctx.measureText('A').emHeightAscent, 40, "ctx.measureText('A').emHeightDescent + ctx.measureText('A').emHeightAscent", "40");
+
+  _assertSame(ctx.measureText('ABCD').emHeightAscent, 20, "ctx.measureText('ABCD').emHeightAscent", "20");
+  _assertSame(ctx.measureText('ABCD').emHeightDescent, 20, "ctx.measureText('ABCD').emHeightDescent", "20");
+  _assertSame(ctx.measureText('ABCD').emHeightDescent + ctx.measureText('ABCD').emHeightAscent, 40, "ctx.measureText('ABCD').emHeightDescent + ctx.measureText('ABCD').emHeightAscent", "40");
+
+}, "Testing emHeights with reduced ascent metric");
+</script>
+