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|---|
| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <script src="../../../resources/testharness.js"></script> |
| 3 <script src="../../../resources/testharnessreport.js"></script> |
| 4 <style> |
| 5 |
| 6 body { margin: 0; height: 5000px; } |
| 7 #evil { height: 200px; width: 200px; background-color: #fcc; } |
| 8 |
| 9 </style> |
| 10 <div id="evil"></div> |
| 11 <script> |
| 12 |
| 13 internals.runtimeFlags.scrollAnchoringEnabled = true; |
| 14 |
| 15 var kMaxAdjustments = 20; // Keep in sync with kMaxAdjustments in ScrollAnchor.c
pp |
| 16 |
| 17 var evil = document.querySelector('#evil'); |
| 18 onscroll = () => { evil.style.marginTop = scrollY + "px"; }; |
| 19 |
| 20 var frame = () => new Promise((resolve) => { requestAnimationFrame(resolve); }); |
| 21 |
| 22 var waitFor = function(condition, failmsg, deadline) { |
| 23 if (!deadline) deadline = Date.now() + 1000; |
| 24 if (condition()) return Promise.resolve(); |
| 25 else if (Date.now() > deadline) return Promise.reject(failmsg); |
| 26 else return frame().then(() => waitFor(condition, failmsg, deadline)); |
| 27 }; |
| 28 |
| 29 var waitFrames = function(n, condition, failmsg) { |
| 30 var p = Promise.resolve(); |
| 31 var check = () => (!condition || condition() ? |
| 32 Promise.resolve() : Promise.reject(failmsg)); |
| 33 while (n--) |
| 34 p = p.then(check).then(frame); |
| 35 return p.then(check); |
| 36 }; |
| 37 |
| 38 var scrollSettlesAt = function(expectedY) { |
| 39 return waitFor(() => (scrollY == expectedY), |
| 40 "scroll did not reach " + expectedY) |
| 41 .then(() => waitFrames(3)) |
| 42 .then(() => waitFrames(3, () => (scrollY == expectedY), |
| 43 "scroll did not stay at " + expectedY)); |
| 44 }; |
| 45 |
| 46 promise_test(function() { |
| 47 var y = 10; |
| 48 return Promise.resolve() |
| 49 .then(() => { scrollTo(0, y); }) |
| 50 .then(() => scrollSettlesAt(y + kMaxAdjustments * y)); |
| 51 }, "Scroll anchoring with scroll event handler feedback loop"); |
| 52 |
| 53 </script> |
| OLD | NEW |
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Chromium Code Reviews
Issue 2118683002:
Limit ScrollAnchor to 20 adjustments between user scrolls. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master