revert-layer-008.html (1110B)
1 <!DOCTYPE html> 2 <title>CSS Cascade Layers: 'revert-layer' triggers a smooth transition</title> 3 <link rel="help" href="https://drafts.csswg.org/css-cascade-5/#revert-layer"> 4 <link rel="author" href="mailto:xiaochengh@chromium.org"> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 8 <style> 9 @layer revert-to, revert-from; 10 11 @layer revert-from { 12 #target { 13 font-size: 10px; 14 transition: font-size 2s linear -1s; 15 } 16 17 #target.reverted { 18 font-size: revert-layer; 19 } 20 } 21 22 @layer revert-to { 23 #target { font-size: 20px; } 24 } 25 </style> 26 27 <div id="target"></div> 28 29 <script> 30 function raf() { 31 return new Promise(resolve => requestAnimationFrame(resolve)); 32 } 33 promise_test(async () => { 34 const target = document.getElementById('target'); 35 getComputedStyle(target).getPropertyValue('font-size'); 36 37 await raf(); 38 target.classList.toggle('reverted'); 39 40 const result = getComputedStyle(target).getPropertyValue('font-size'); 41 assert_equals(result, '15px'); 42 }, "'revert-layer' should revert font-size to 20px and trigger a smooth transition"); 43 </script>