| <!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> |