inline-flow-shift-vertical-rl.html (1602B)
1 <!DOCTYPE html> 2 <title>Layout Instability: vertical-rl inline/text movement is detected</title> 3 <link rel="help" href="https://wicg.github.io/layout-instability/" /> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <script src="resources/util.js"></script> 7 <body style="writing-mode: vertical-rl"> 8 <div style="height: 200px; font-size: 20px; line-height: 25px"> 9 1AAAAAAA<br> 10 2AAAAAAA<br> 11 3AAAAAAA<br> 12 <div id="inline-block" style="display: inline-block; width: 50px">4AAAAAAA</div><br> 13 5AAAAAAA<br> 14 6AAAAAAA<br> 15 7AAAAAAA<br> 16 </div> 17 <script> 18 19 promise_test(async () => { 20 const watcher = new ScoreWatcher; 21 22 // Wait for the initial render to complete. 23 await waitForAnimationFrames(2); 24 25 // Modify the position of the div. 26 const inline_block = document.querySelector("#inline-block"); 27 inline_block.style.width = '100px'; 28 29 // The lines below the inline-block are shifted down by 50px. 30 // The implementation may measure the real width of the shifted text 31 // or use the available width (i.e. width of the containing block). 32 // Also tolerate extra 10% error. 33 const text_width = inline_block.offsetWidth; 34 const expectedScoreMin = computeExpectedScore(text_width * (20 * 3 + 50), 50) * 0.9; 35 const expectedScoreMax = computeExpectedScore(200 * (25 * 3 + 50), 50) * 1.1; 36 37 // Observer fires after the frame is painted. 38 assert_equals(watcher.score, 0); 39 await watcher.promise; 40 assert_between_exclusive(watcher.score, expectedScoreMin, expectedScoreMax); 41 }, 'Vertical-rl inline flow movement.'); 42 43 </script> 44 </body>