| <!DOCTYPE html> |
| <script src="../resources/js-test.js"></script> |
| <script src="helper-functions.js"></script> |
| <style> |
| #root { |
| width: 200px; |
| height: 200px; |
| overflow-y: scroll; |
| } |
| #target { |
| width: 100px; |
| height: 100px; |
| background-color: green; |
| position: absolute; |
| } |
| </style> |
| <div id="root" style="position: absolute"> |
| <div id="target" style="left: 50px; top: 250px"></div> |
| </div> |
| |
| <script> |
| description("Test that no notifications are generated when root is not in the containing block chain of target."); |
| var root = document.getElementById("root"); |
| var target = document.getElementById("target"); |
| var entries = []; |
| |
| var observer = new IntersectionObserver( |
| changes => { entries = entries.concat(changes) }, |
| { root: root } |
| ); |
| |
| onload = function() { |
| observer.observe(target); |
| shouldBeEqualToNumber("entries.length", 0); |
| target.style.top = "10px"; |
| // See README for explanation of double RAF. |
| requestAnimationFrame(() => { requestAnimationFrame(step1) }); |
| }; |
| |
| function step1() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 1); |
| if (entries.length > 0) { |
| shouldBeEqualToNumber("entries[0].boundingClientRect.left", 58); |
| shouldBeEqualToNumber("entries[0].boundingClientRect.right", 158); |
| shouldBeEqualToNumber("entries[0].boundingClientRect.top", 18); |
| shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 118); |
| shouldBeEqualToNumber("entries[0].intersectionRect.left", 58); |
| shouldBeEqualToNumber("entries[0].intersectionRect.right", 158); |
| shouldBeEqualToNumber("entries[0].intersectionRect.top", 18); |
| shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 118); |
| shouldBeEqualToNumber("entries[0].rootBounds.left", 8); |
| shouldBeEqualToNumber("entries[0].rootBounds.right", 193); |
| shouldBeEqualToNumber("entries[0].rootBounds.top", 8); |
| shouldBeEqualToNumber("entries[0].rootBounds.bottom", 208); |
| shouldEvaluateToSameObject("entries[0].target", target); |
| } |
| target.style.top = "250px"; |
| requestAnimationFrame(step2); |
| } |
| |
| function step2() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 2); |
| if (entries.length > 1) { |
| shouldBeEqualToNumber("entries[1].boundingClientRect.left", 58); |
| shouldBeEqualToNumber("entries[1].boundingClientRect.right", 158); |
| shouldBeEqualToNumber("entries[1].boundingClientRect.top", 258); |
| shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 358); |
| shouldBeEqualToNumber("entries[1].intersectionRect.left", 0); |
| shouldBeEqualToNumber("entries[1].intersectionRect.right", 0); |
| shouldBeEqualToNumber("entries[1].intersectionRect.top", 0); |
| shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0); |
| shouldBeEqualToNumber("entries[1].rootBounds.left", 8); |
| shouldBeEqualToNumber("entries[1].rootBounds.right", 193); |
| shouldBeEqualToNumber("entries[1].rootBounds.top", 8); |
| shouldBeEqualToNumber("entries[1].rootBounds.bottom", 208); |
| shouldEvaluateToSameObject("entries[1].target", target); |
| } |
| root.style.position = "static"; |
| target.style.top = "10px"; |
| requestAnimationFrame(step3); |
| } |
| |
| function step3() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 2); |
| target.style.top = "250px"; |
| requestAnimationFrame(step4); |
| } |
| |
| function step4() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 2); |
| finishJSTest(); |
| } |
| </script> |
