tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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invalid-child.https.html (2106B)

      1 <!DOCTYPE html>
      2 <html class=reftest-wait>
      3 <link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#invoke-a-layout-callback">
      4 <link rel="match" href="fallback-layout-fallback-ref.html">
      5 <meta name="assert" content="This test checks that a layout() class performing layout on an invalid child will fallback to block layout." />
      6 <style>
      7 .test {
      8  background: red;
      9  border: solid 2px;
     10  width: 100px;
     11 }
     12 
     13 .test > div {
     14  height: 100px;
     15 }
     16 
     17 @supports (display: layout(bad-child-layout)) {
     18  .test {
     19    display: layout(bad-child-layout);
     20    background: green;
     21  }
     22 }
     23 </style>
     24 <script src="/common/reftest-wait.js"></script>
     25 <script src="/common/worklet-reftest.js"></script>
     26 
     27 <div class="test">
     28  <div></div>
     29 </div>
     30 
     31 <script id="code" type="text/worklet">
     32 registerLayout('bad-child-layout', class {
     33  static get inputProperties() { return ['--fail']; }
     34 
     35  async intrinsicSizes() {}
     36  async layout(children, _, __, styleMap) {
     37    if (styleMap.get('--fail').toString() !== 'true') {
     38      this.child = children[0];
     39    }
     40 
     41    // Try to perform layout on the child. If its invalid (we skipped the if
     42    // statement above) we should fallback to block layout.
     43    const fragment = await this.child.layoutNextFragment({});
     44 
     45    return {autoBlockSize: 0, childFragments: [fragment]};
     46  }
     47 });
     48 </script>
     49 
     50 <script>
     51 function raf() {
     52  return new Promise((resolve) => {
     53    requestAnimationFrame(() => {
     54      resolve();
     55    });
     56  });
     57 }
     58 
     59 (async function() {
     60  if (typeof CSS.layoutWorklet === 'undefined') {
     61    takeScreenshot();
     62    return;
     63  }
     64 
     65  await importWorklet(CSS.layoutWorklet, document.getElementById('code').textContent);
     66 
     67  // Ensure that all instances have a child to perform an invalid layout upon.
     68  const test = document.getElementsByClassName('test')[0];
     69  for (let i = 0; i < 100; i++) {
     70    test.innerHTML = '<div><div>';
     71    await raf();
     72  }
     73 
     74  // The next layout should mean that we will fallback to block.
     75  test.innerHTML = '<div></div>';
     76  test.style.setProperty('--fail', 'true');
     77 
     78  // Finish up the test.
     79  await raf();
     80  await raf();
     81  takeScreenshot();
     82 })();
     83 </script>
     84 </html>