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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <script src="../resources/js-test.js"></script> |
| 3 <script src="helper-functions.js"></script> |
| 4 <style> |
| 5 #root { |
| 6 overflow: visible; |
| 7 height: 200px; |
| 8 width: 200px; |
| 9 border: 7px solid black; |
| 10 } |
| 11 #target { |
| 12 width: 100px; |
| 13 height: 100px; |
| 14 background-color: green; |
| 15 } |
| 16 </style> |
| 17 <div id="root"> |
| 18 <div id="target" style="transform: translateY(300px)"></div> |
| 19 </div> |
| 20 |
| 21 <script> |
| 22 description("Test that border bounding box is used to calculate intersection wit
h a non-scrolling root."); |
| 23 var target = document.getElementById("target"); |
| 24 var root = document.getElementById("root"); |
| 25 var entries = []; |
| 26 var observer = new IntersectionObserver( |
| 27 changes => { entries.push(...changes) }, |
| 28 { root: document.getElementById("root") } |
| 29 ); |
| 30 |
| 31 onload = function() { |
| 32 observer.observe(target); |
| 33 entries.push(...observer.takeRecords()); |
| 34 shouldBeEqualToNumber("entries.length", 0); |
| 35 // See README for explanation of double RAF. |
| 36 requestAnimationFrame(() => { requestAnimationFrame(step0) }); |
| 37 } |
| 38 |
| 39 function step0() { |
| 40 entries.push(...observer.takeRecords()); |
| 41 shouldBeEqualToNumber("entries.length", 0); |
| 42 target.style.transform = "translateY(195px)"; |
| 43 requestAnimationFrame(step1); |
| 44 } |
| 45 |
| 46 function step1() { |
| 47 entries.push(...observer.takeRecords()); |
| 48 shouldBeEqualToNumber("entries.length", 1); |
| 49 if (entries.length > 0) { |
| 50 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 15); |
| 51 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 115); |
| 52 shouldBeEqualToNumber("entries[0].boundingClientRect.top", 210); |
| 53 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 310); |
| 54 shouldBeEqualToNumber("entries[0].intersectionRect.left", 15); |
| 55 shouldBeEqualToNumber("entries[0].intersectionRect.right", 115); |
| 56 shouldBeEqualToNumber("entries[0].intersectionRect.top", 210); |
| 57 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 222); |
| 58 shouldBeEqualToNumber("entries[0].rootBounds.left", 8); |
| 59 shouldBeEqualToNumber("entries[0].rootBounds.right", 222); |
| 60 shouldBeEqualToNumber("entries[0].rootBounds.top", 8); |
| 61 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 222); |
| 62 shouldEvaluateToSameObject("entries[0].target", target); |
| 63 } |
| 64 |
| 65 finishJSTest(); |
| 66 } |
| 67 </script> |
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Chromium Code Reviews
Issue 1814553003:
IntersectionObserver: use border box rect for unclipped root. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src@intersection-observer-idle-callback