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diff --git a/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.measure.emHeights-zero-descent.html b/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.measure.emHeights-zero-descent.html
new file mode 100644
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+++ b/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.measure.emHeights-zero-descent.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.text.measure.emHeights-zero-descent</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.text.measure.emHeights-zero-descent</h1>
+<p class="desc">Testing emHeights with zero descent metric</p>
+
+
+<script>
+promise_test(async t => {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  var f = new FontFace("CanvasTest-descent0", "url('/fonts/CanvasTest-descent0.ttf')");
+  f.load();
+  document.fonts.add(f);
+  await document.fonts.ready;
+  ctx.font = '40px CanvasTest-descent0';
+  ctx.direction = 'ltr';
+  ctx.align = 'left'
+  _assertSame(ctx.measureText('A').emHeightAscent, 40, "ctx.measureText('A').emHeightAscent", "40");
+  _assertSame(ctx.measureText('A').emHeightDescent, 0, "ctx.measureText('A').emHeightDescent", "0");
+  _assertSame(ctx.measureText('A').emHeightDescent + ctx.measureText('A').emHeightAscent, 40, "ctx.measureText('A').emHeightDescent + ctx.measureText('A').emHeightAscent", "40");
+
+  _assertSame(ctx.measureText('ABCD').emHeightAscent, 40, "ctx.measureText('ABCD').emHeightAscent", "40");
+  _assertSame(ctx.measureText('ABCD').emHeightDescent, 0, "ctx.measureText('ABCD').emHeightDescent", "0");
+  _assertSame(ctx.measureText('ABCD').emHeightDescent + ctx.measureText('ABCD').emHeightAscent, 40, "ctx.measureText('ABCD').emHeightDescent + ctx.measureText('ABCD').emHeightAscent", "40");
+
+}, "Testing emHeights with zero descent metric");
+</script>