| <!doctype HTML> |
| <html> |
| <meta charset="utf8"> |
| <title>Content Visibility: first visibility determination happens before resize observer.</title> |
| <link rel="author" title="Vladimir Levin" href="mailto:[email protected]"> |
| <link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility"> |
| <meta name="assert" content="first visibility determination happens before resize observer"> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| #target { |
| content-visibility: auto; |
| contain-intrinsic-size: 10px; |
| } |
| #child { |
| height: 100px; |
| } |
| </style> |
| |
| <div id=container></div> |
| |
| <script> |
| promise_test(t => new Promise(async (resolve, reject) => { |
| requestAnimationFrame(() => { |
| let target = document.createElement("div"); |
| target.id = "target"; |
| |
| let child = document.createElement("div"); |
| child.id = "child"; |
| target.appendChild(child); |
| |
| const resizeObserver = new ResizeObserver((entries) => { |
| for (const entry of entries) { |
| if (entry.contentBoxSize) { |
| if (entry.contentBoxSize[0].blockSize == 100) { |
| resolve(); |
| return; |
| } else { |
| reject(`unexpected size ${entry.contentBoxSize[0].blockSize}`); |
| return; |
| } |
| } |
| } |
| reject("no content boxes or no entries"); |
| }); |
| |
| container.appendChild(target); |
| resizeObserver.observe(target); |
| }); |
| }), "Target is sized and laid out before resize observer"); |
| </script> |
