| <!DOCTYPE HTML> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script src="../../resources/run-after-layout-and-paint.js"></script> |
| <script src="../../resources/gesture-util.js"></script> |
| <style> |
| body { |
| height: 200vh; |
| width: 200vw; |
| margin: 0; |
| } |
| #subframe { |
| width: 100px; |
| height: 100px; |
| background-color: black; |
| overflow: scroll; |
| } |
| #subframe-content { |
| width: 200px; |
| height: 200px; |
| background-color: black; |
| } |
| </style> |
| |
| <div id="subframe"> |
| <div id="subframe-content"></div> |
| </div> |
| |
| <script> |
| if (window.internals) |
| internals.settings.setScrollAnimatorEnabled(false); |
| |
| var receivedMousedownEvent = false; |
| document.addEventListener('mousedown', function(e) { |
| e.preventDefault(); |
| receivedMousedownEvent = true; |
| }); |
| |
| function testFrameScrollbar() { |
| window.scrollTo(0, 10); |
| return mouseClickOn(window.innerWidth - 5, 1); |
| } |
| |
| function testDivScrollbar() { |
| receivedMousedownEvent = false; |
| var subframe = document.getElementById('subframe'); |
| subframe.scrollTop = 10; |
| return mouseClickOn(100 - 5, 1); |
| } |
| |
| promise_test(async () => { |
| // Wait for the promise that gets resloved in runAfterLayoutAndPaint's callback. |
| await WaitForlayoutAndPaint(); |
| |
| // Test the frame scrollbar. |
| await testFrameScrollbar(); |
| waitFor(() => { return receivedMousedownEvent; } ); |
| waitFor(() => { return window.scrollY == 0; } ); |
| |
| // Test the div scrollbar. |
| await testDivScrollbar(); |
| waitFor(() => { return receivedMousedownEvent; } ); |
| waitFor(() => { return subframe.scrollTop == 0; } ); |
| }, 'This tests that scrollbars always receive events even when there is an ' + |
| 'element underneath the scrollbar which swallows the event. In this case ' + |
| 'an event handler is added to the window which swallows the event but ' + |
| 'this may also happen with elements underneath of overlay scrollbars.'); |
| </script> |
