| <!DOCTYPE html> |
| <title>Scrollbar forward button must not scroll ancestor</title> |
| <script src="../../../resources/testharness.js"></script> |
| <script src="../../../resources/testharnessreport.js"></script> |
| <script src="../../../resources/gesture-util.js"></script> |
| <style> |
| .subscroller { |
| width:100px; |
| height:100px; |
| overflow:auto; |
| position:absolute; |
| top:0px; |
| left:0px; |
| } |
| .subscroller>.child { |
| height:400px; |
| } |
| .talldiv { |
| height:4000px; |
| } |
| </style> |
| |
| <div class="subscroller"> |
| <div class="child">subscroller</div> |
| </div> |
| <div class="talldiv">talldiv</div> |
| |
| <script> |
| |
| promise_test(async (test) => { |
| // This specifically tests the impact of clicking the scrollbar button |
| // when scroller is at max offset. Since Mac scrollbars don't have any |
| // buttons, this test is irrelevant. |
| if(navigator.userAgent.search(/\bMac OS X\b/) != -1) |
| return; |
| |
| // Scroll the subscroller to the end, on the y-axis |
| let subscroller = document.querySelector(".subscroller"); |
| subscroller.scrollTo(0, 400); |
| assert_equals(subscroller.scrollTop, 300); |
| |
| // Click down for a period of time, but grow the content inside the |
| // subscroller to ensure autoscrolling of the pressed part works. |
| await mouseDownAt(95, 95); |
| |
| window.requestAnimationFrame(function() { |
| document.querySelector('.child').style.height = "1000px"; |
| }); |
| |
| let pointerPauseThenUp = new Promise((resolve, reject) => { |
| chrome.gpuBenchmarking.pointerActionSequence([{ |
| source: 'mouse', |
| // The autoscroll time begins 250ms after the mouse down so we add a |
| // bit of buffer. |
| actions: [{ 'name': 'pause', duration: 300 }, |
| { 'name': 'pointerUp' }] |
| }], resolve); |
| }); |
| |
| await pointerPauseThenUp; |
| |
| assert_equals(window.scrollY, 0, "Root scroller must not scroll when " + |
| "subscroller is scrolled with scrollbars"); |
| assert_greater_than(subscroller.scrollTop, 300, "Subscroller must continue " + |
| "scrolling when mouse is held down and it grows in height"); |
| }, "Clicking a scrollbar that is at its maximum offset must not scroll " + |
| "its parent in the scroll chain"); |
| </script> |
