| <!DOCTYPE html> |
| <script src='../../resources/testharness.js'></script> |
| <script src='../../resources/testharnessreport.js'></script> |
| <script src='../../resources/gesture-util.js'></script> |
| |
| <style> |
| body, html { |
| margin: 0; |
| width: 100%; |
| height: 100%; |
| } |
| |
| #fixed { |
| position: fixed; |
| width: 80%; |
| height: 80%; |
| top: 10%; |
| left: 10%; |
| padding: 20px; |
| box-sizing: border-box; |
| background-color: PaleTurquoise; |
| overflow-y: scroll; |
| } |
| |
| #instructions { |
| width: 100%; |
| height: 100px; |
| text-align: center; |
| } |
| |
| #scroller { |
| position: absolute; |
| border: 5px solid salmon; |
| clip: rect(0px, 1000px, 500px, 0px); |
| width: 90%; |
| height: 300px; |
| overflow-y: scroll; |
| } |
| |
| .box { |
| position: fixed; |
| width: 200px; |
| height: 200px; |
| border: 2px solid black; |
| background-color: lightgrey; |
| } |
| |
| .subbox { |
| width: 100%; |
| height: 80%; |
| } |
| |
| .composited { |
| will-change: transform; |
| } |
| |
| .scrolls { |
| overflow: auto; |
| } |
| |
| .spacer { |
| height: 400%; |
| width: 100%; |
| background:repeating-linear-gradient(#FFF 0%, #FFF 10%, #000 10%, #000 20%); |
| |
| } |
| </style> |
| |
| <div id="fixedScroller" class="box scrolls" style="left: 20px; top: 20px"> |
| <div class="spacer"></div> |
| position: fixed scroller |
| </div> |
| |
| <div id="childScroller" class="box" style="right: 20px; top: 20px"> |
| Scroller child of position: fixed non-scroller |
| <div class="scrolls subbox"> |
| <div class="spacer"></div> |
| </div> |
| </div> |
| |
| <div id="childScrollerFixedScroller" class="box scrolls" |
| style="left: 20px; bottom: 20px"> |
| <div class="spacer"></div> |
| Scroller child of position: fixed scroller |
| <div class="scrolls subbox"> |
| <div class="spacer"></div> |
| </div> |
| </div> |
| |
| <div id="fixedScrollerInFixedTransform" class="box" |
| style="right: 20px; bottom: 20px; will-change: transform;"> |
| position: fixed scroller child in position: fixed non-scroller |
| <div class="scrolls subbox" style="position: fixed; top: 40px"> |
| <div class="spacer"></div> |
| </div> |
| </div> |
| <div class="spacer"></div> |
| |
| <script> |
| async function scrollBox(box) { |
| const delta = 100; |
| // This relies on the fact that the center point of each box is in the |
| // scroller. |
| const location = elementCenter(box); |
| await smoothScroll(delta, |
| location.x, |
| location.y, |
| GestureSourceType.TOUCH_INPUT, |
| 'down', |
| SPEED_INSTANT); |
| } |
| |
| function reset() { |
| window.scrollTo(0, 0); |
| } |
| |
| window.onload = async () => { |
| // Start with all the scrollers scrolled to their maximal extent. That way |
| // new scrolls should chain. |
| const scrollers = document.querySelectorAll('.scrolls'); |
| for(let scroller of scrollers) |
| scroller.scrollTop = 10000; |
| |
| promise_test(async () => { |
| reset(); |
| await waitForCompositorCommit(); |
| assert_equals(window.scrollY, 0, 'Main window starts off unscrolled.'); |
| await scrollBox(document.getElementById('fixedScroller')); |
| |
| assert_greater_than(window.scrollY, 0, |
| 'Scroll should chained to main window.'); |
| |
| }, 'Position: fixed scroller'); |
| |
| promise_test(async () => { |
| reset(); |
| await waitForCompositorCommit(); |
| assert_equals(window.scrollY, 0, 'Main window starts off unscrolled.'); |
| await scrollBox(document.getElementById('childScroller')); |
| |
| assert_greater_than(window.scrollY, 0, |
| 'Scroll should chained to main window.'); |
| |
| }, 'Child scroller of position:fixed layer'); |
| |
| promise_test(async () => { |
| reset(); |
| await waitForCompositorCommit(); |
| assert_equals(window.scrollY, 0, 'Main window starts off unscrolled.'); |
| await scrollBox(document.getElementById('childScrollerFixedScroller')); |
| |
| assert_greater_than(window.scrollY, 0, |
| 'Scroll should chained to main window.'); |
| |
| }, 'Child scroller of position:fixed scroller'); |
| |
| promise_test(async () => { |
| reset(); |
| await waitForCompositorCommit(); |
| assert_equals(window.scrollY, 0, 'Main window starts off unscrolled.'); |
| await scrollBox(document.getElementById('fixedScrollerInFixedTransform')); |
| |
| assert_greater_than(window.scrollY, 0, |
| 'Scroll should chained to main window.'); |
| |
| }, 'Child position:fixed scroller in fixed and transformed layer'); |
| } |
| |
| </script> |
