| <!DOCTYPE html> |
| <title>Tests that anchored element's actual rendered location is property exposed via JS APIs under scrolling</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll"> |
| <link rel="author" href="mailto:xiaochengh@chromium.org"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| #container { |
| position: absolute; |
| top: 0px; |
| left: 0px; |
| } |
| #scroller { |
| margin-left: 100px; |
| margin-top: 100px; |
| width: 400px; |
| height: 400px; |
| overflow: scroll; |
| } |
| #anchor-container { |
| width: 2000px; |
| height: 1000px; |
| } |
| #anchor { |
| margin: 400px; |
| margin-left: 1400px; |
| width: 100px; |
| height: 100px; |
| background-color: yellow; |
| anchor-name: --anchor; |
| } |
| #anchored { |
| position: absolute; |
| left: anchor(left); |
| bottom: anchor(top); |
| width: 100px; |
| height: 100px; |
| position-anchor: --anchor; |
| background-color: green; |
| } |
| </style> |
| |
| <div id="container"> |
| <div id="scroller"> |
| <div id="anchor"></div> |
| </div> |
| <div id="anchored">Text</div> |
| </div> |
| |
| <script> |
| promise_setup(async () => { |
| // Move both the anchor and the anchored elements into the visible area of the |
| // scroller. This also runs layout to setup an empty scroll snapshot. |
| scroller.scrollTop = 300; |
| scroller.scrollLeft = 1300; |
| |
| // Ensure up-to-date scroll snapshot. |
| await new Promise(resolve => { |
| requestAnimationFrame(() => { |
| requestAnimationFrame(resolve); |
| }); |
| }); |
| }); |
| |
| promise_test(async () => { |
| let rect = anchored.getBoundingClientRect(); |
| assert_equals(rect.x, 200); |
| assert_equals(rect.y, 100); |
| }, 'Element.getBoundingClientRect() returns the actual rendered location'); |
| |
| promise_test(async () => { |
| let range = document.createRange(); |
| let text = anchored.firstChild; |
| range.setStart(text, 0); |
| range.setEnd(text, text.length); |
| let rect = range.getBoundingClientRect(); |
| assert_equals(rect.x, 200); |
| assert_equals(rect.y, 100); |
| }, 'Range.getBoundingClientRect() returns the actual rendered location'); |
| |
| promise_test(async () => { |
| assert_equals(anchored.offsetLeft, 200); |
| assert_equals(anchored.offsetTop, 100); |
| }, 'Element.offset* return adjusted offsets'); |
| |
| promise_test(() => new Promise(resolve => { |
| let observer = new IntersectionObserver(entryList => { |
| if (entryList.some(entry => entry.isIntersecting)) |
| resolve(); |
| }); |
| observer.observe(anchored); |
| }), 'IntersectionObserver should fire when anchored element is moved into visible area'); |
| </script> |
