| <!DOCTYPE html> |
| <html> |
| <link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#invoke-a-layout-callback"> |
| <meta name="assert" content="This test checks running the microtask queue for a layout() class won't run the main world's microtask queue." /> |
| <style> |
| #test { |
| display: layout(child-layout); |
| width: 100px; |
| } |
| |
| #test > div { |
| height: 100px; |
| } |
| </style> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/common/worklet-reftest.js"></script> |
| |
| <div id="test"> |
| <div></div> |
| </div> |
| |
| <script id="code" type="text/worklet"> |
| registerLayout('child-layout', class { |
| async intrinsicSizes() {} |
| async layout([child]) { |
| const fragment = await child.layoutNextFragment(); |
| return {autoBlockSize: 50, childFragments: [fragment]}; |
| } |
| }); |
| </script> |
| |
| <script> |
| promise_test(async t => { |
| if (typeof CSS.layoutWorklet === 'undefined') { |
| throw Error('CSS Layout API not supported.'); |
| } |
| |
| await importWorklet(CSS.layoutWorklet, document.getElementById('code').textContent); |
| |
| let resolved = false; |
| let p = Promise.resolve().then(() => { |
| resolved = true; |
| }); |
| assert_false(resolved); |
| |
| // Running the layout-worklet's microtask queue shouldn't trigger the main |
| // world's microtask queue. |
| assert_equals(document.getElementById('test').clientHeight, 50); |
| assert_false(resolved); |
| |
| await p; |
| assert_true(resolved); |
| }); |
| </script> |
| </html> |
