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| 1 <!DOCTYPE html> |
| 2 <script src="../../../resources/testharness.js"></script> |
| 3 <script src="../../../resources/testharnessreport.js"></script> |
| 4 <style> |
| 5 body { |
| 6 margin: 0; |
| 7 } |
| 8 |
| 9 #scroller { |
| 10 height: 100px; |
| 11 width: 200px; |
| 12 overflow-y: scroll; |
| 13 } |
| 14 |
| 15 .paddingBefore { |
| 16 height: 150px; |
| 17 } |
| 18 |
| 19 #sticky { |
| 20 height: 50px; |
| 21 position: sticky; |
| 22 top: 20px; |
| 23 } |
| 24 |
| 25 .paddingAfter { |
| 26 height: 500px; |
| 27 } |
| 28 </style> |
| 29 |
| 30 <div id="scroller"> |
| 31 <div class="paddingBefore"></div> |
| 32 <div id="writer"></div> |
| 33 <div id="sticky"></div> |
| 34 <div class="paddingAfter"></div> |
| 35 </div> |
| 36 |
| 37 <script> |
| 38 if (window.internals) { |
| 39 internals.settings.setCSSStickyPositionEnabled(true); |
| 40 } |
| 41 |
| 42 // These tests currently mimic the behavior of Firefox for the interaction |
| 43 // between scrollIntoView() and position:sticky, where the offset location of |
| 44 // the sticky element is used to determine how far to scroll. This means that |
| 45 // scrollIntoView() may scroll even when the sticky is already 'in view', and |
| 46 // attempts to scroll so that the offset position of the sticky is at the top |
| 47 // of the screen. |
| 48 // |
| 49 // TODO(smcgruer): Update tests once http://crbug.com/664246 is resolved. |
| 50 |
| 51 test(function() { |
| 52 var scroller = document.getElementById('scroller'); |
| 53 var sticky = document.getElementById('sticky'); |
| 54 var writer = document.getElementById('writer'); |
| 55 |
| 56 // Clean the writer. |
| 57 writer.innerHTML = ''; |
| 58 |
| 59 // With no scroll, the sticky element is outside the scroller viewport. |
| 60 scroller.scrollTop = 0; |
| 61 |
| 62 // Deliberately dirty layout to make sure that scrollIntoView() still works. |
| 63 writer.innerHTML = '<div style="height: 50px;"></div>'; |
| 64 |
| 65 sticky.scrollIntoView(); |
| 66 assert_equals(scroller.scrollTop, 200); |
| 67 }, "scrollIntoView should scroll when sticky is not visible"); |
| 68 |
| 69 test(function() { |
| 70 var scroller = document.getElementById('scroller'); |
| 71 var sticky = document.getElementById('sticky'); |
| 72 var writer = document.getElementById('writer'); |
| 73 |
| 74 // Clean the writer. |
| 75 writer.innerHTML = ''; |
| 76 |
| 77 // Scroll so that the sticky element is past the top of the scroller |
| 78 // viewport, and is thus sticking. |
| 79 scroller.scrollTop = 200; |
| 80 |
| 81 // Deliberately dirty layout to make sure that scrollIntoView() still works. |
| 82 writer.innerHTML = '<div style="height: 10px;"></div>'; |
| 83 |
| 84 // See comment above tests for why this shifts by an additional 20 pixels. |
| 85 sticky.scrollIntoView(); |
| 86 assert_equals(scroller.scrollTop, 230); |
| 87 }, "scrollIntoView should scroll when sticky is already in view"); |
| 88 |
| 89 test(function() { |
| 90 var scroller = document.getElementById('scroller'); |
| 91 var sticky = document.getElementById('sticky'); |
| 92 var writer = document.getElementById('writer'); |
| 93 |
| 94 // Clean the writer. |
| 95 writer.innerHTML = ''; |
| 96 |
| 97 // With no scroll, the sticky element is outside the scroller viewport. |
| 98 scroller.scrollTop = 0; |
| 99 |
| 100 // Deliberately dirty layout to make sure that scrollIntoViewIfNeeded() |
| 101 // still works. |
| 102 writer.innerHTML = '<div style="height: 70px;"></div>'; |
| 103 |
| 104 sticky.scrollIntoViewIfNeeded(); |
| 105 assert_equals(scroller.scrollTop, 195); |
| 106 }, "scrollIntoViewIfNeeded should scroll when sticky is not visible"); |
| 107 |
| 108 test(function() { |
| 109 var scroller = document.getElementById('scroller'); |
| 110 var sticky = document.getElementById('sticky'); |
| 111 var writer = document.getElementById('writer'); |
| 112 |
| 113 // Clean the writer. |
| 114 writer.innerHTML = ''; |
| 115 |
| 116 // Scroll so that the sticky element is at the top of the scroller viewport. |
| 117 scroller.scrollTop = 150; |
| 118 |
| 119 // Deliberately dirty layout to make sure that scrollIntoViewIfNeeded() |
| 120 // still works. |
| 121 writer.innerHTML = '<div style="height: 20px;"></div>'; |
| 122 |
| 123 sticky.scrollIntoViewIfNeeded(); |
| 124 assert_equals(scroller.scrollTop, 170); |
| 125 }, "scrollIntoViewIfNeeded should not scroll when sticky is already in view"); |
| 126 </script> |
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