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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <script src="../../../resources/testharness.js"></script> |
| 3 <script src="../../../resources/testharnessreport.js"></script> |
| 4 <script src="resources/scroll-anchoring-test.js"></script> |
| 5 <style> |
| 6 body { |
| 7 margin: 0px; |
| 8 height: 1500px; |
| 9 } |
| 10 #a { |
| 11 height: 200px; |
| 12 } |
| 13 #b { |
| 14 position: absolute; |
| 15 left: 50px; |
| 16 height:200px; |
| 17 width: 200px; |
| 18 background-color: #fcc; |
| 19 } |
| 20 </style> |
| 21 |
| 22 <div id="a"></div> |
| 23 <div id="b"></div> |
| 24 |
| 25 <script> |
| 26 internals.runtimeFlags.scrollAnchoringEnabled = true; |
| 27 |
| 28 // We start of by scrolling #b out of the viewport by 20px. The scroll handler |
| 29 // fixes #b to the viewport by updating its style.top value. This triggers |
| 30 // layout during which we anchor to #b. Because the scroll handler moves #b |
| 31 // back into the viewport, we make an incorrect adjustment. This adjustment |
| 32 // fires the handler and triggers another layout as #b is scrolled out of the |
| 33 // viewport. |
| 34 |
| 35 // The current solution here is for ScrollAnchor to not anchor to absolute |
| 36 // positioned elements. |
| 37 |
| 38 var b = document.querySelector('#b'); |
| 39 // The initial position of b relative to the document. |
| 40 var initialTop = 200; |
| 41 |
| 42 onscroll = function() { |
| 43 var y = scrollY; |
| 44 if (y > initialTop) |
| 45 b.style.top = (y + 10) + 'px'; |
| 46 else |
| 47 b.style.top = ''; |
| 48 }; |
| 49 |
| 50 promise_test(function() { |
| 51 var scrollBy = initialTop + 20; |
| 52 return Promise.resolve() |
| 53 .then(() => { eventSender.continuousMouseScrollBy(0, -scrollBy); }) |
| 54 .then(() => scrollSettlesAt(scrollBy)); |
| 55 }, "Scroll anchoring position fixed using scroll top"); |
| 56 |
| 57 </script> |
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Chromium Code Reviews
Issue 2002623003:
Exclude position:absolute elements when picking an anchor for ScrollAnchoring (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master