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+<!DOCTYPE HTML>
+<title>document.fonts.ready resolves after layout depending on loaded fonts</title>
+<link rel="help" href="https://drafts.csswg.org/css-font-loading/#fontfaceset-pending-on-the-environment">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+ #foo {
+ font: 100px/1 Ahem;
+ }
+</style>
+<div id="log"></div>
+<span id="foo">X</span>
+<script>
+ // The purpose of this test is to ensure that testharness.js tests can use
+ // `document.fonts.ready` to wait for a web font to load, without having to
+ // wait for the window load event before or requestAnimationFrame after.
+ //
+ // The spec says that a FontFaceSet is "pending on the environment" if "the
+ // document has pending layout operations which might cause the user agent to
+ // request a font, or which depend on recently-loaded fonts", and both are
+ // assumed to hold true in this test.
+ async_test(t => {
+ assert_equals(document.fonts.size, 1, 'one font is pending');
+ document.fonts.ready.then(t.step_func_done(() => {
+ const span = document.getElementById('foo');
+ const rect = span.getBoundingClientRect();
+ // If Ahem has loaded, the X will be 100px wide.
+ assert_equals(rect.width, 100, 'span is 100px wide');
+ }));
+ });
+</script>