| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>ResizeObserver with multiple fragments</title> |
| <link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com"> |
| <link rel="help" href="https://drafts.csswg.org/resize-observer-1/"> |
| <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3673"> |
| <meta name="assert" content="Tests ResizeObserver supports multiple fragments." /> |
| |
| <style> |
| #wrapper { |
| column-width: 100px; |
| width: max-content; |
| height: 100px; |
| margin: 10px; |
| } |
| #target { |
| outline: solid; |
| background: orange; |
| } |
| .w50 { |
| width: 50px; |
| } |
| .w75 { |
| width: 75px; |
| } |
| .h100 { |
| height: 100px; |
| } |
| .h150 { |
| height: 150px; |
| } |
| .h175 { |
| height: 175px; |
| } |
| </style> |
| |
| <div id="log"></div> |
| |
| <div id="wrapper"> |
| <div id="target"></div> |
| </div> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| const target = document.getElementById("target"); |
| |
| const nextSizes = (() => { |
| let callback = null; |
| new ResizeObserver((entries) => { |
| if (callback) { |
| callback(entries[0].contentBoxSize); |
| callback = null; |
| } |
| }).observe(target); |
| return () => { |
| if (callback) { |
| throw "Already awaiting another notification"; |
| } |
| return new Promise((resolve, reject) => { |
| callback = resolve; |
| requestAnimationFrame(() => { |
| requestAnimationFrame(() => { |
| reject("Missing ResizeObserver notification"); |
| callback = null; |
| }); |
| }); |
| }); |
| }; |
| })(); |
| |
| function checkSizes(className, expectedSizes, msg) { |
| promise_test(async () => { |
| await new Promise(requestAnimationFrame); |
| target.className = className; |
| let sizes; |
| try { |
| sizes = await nextSizes(); |
| } catch (error) { |
| assert_unreached(error); |
| } |
| assert_equals(sizes.length, expectedSizes.length, "number of fragments"); |
| for (let i = 0; i < sizes.length; ++i) { |
| assert_equals(sizes[i].inlineSize, expectedSizes[i][0], `fragment #${i+1} inline size`); |
| assert_equals(sizes[i].blockSize, expectedSizes[i][1], `fragment #${i+1} block size`); |
| } |
| }, msg); |
| } |
| |
| checkSizes( |
| "w50 h100", |
| [[50, 100]], |
| "Single fragment" |
| ); |
| checkSizes( |
| "w50 h150", |
| [[50, 100], [50, 50]], |
| "Adding 2nd fragment" |
| ); |
| checkSizes( |
| "w50 h175", |
| [[50, 100], [50, 75]], |
| "Resizing 2nd fragment" |
| ); |
| checkSizes( |
| "w75 h175", |
| [[75, 100], [75, 75]], |
| "Resizing all fragments" |
| ); |
| checkSizes( |
| "w75 h100", |
| [[75, 100]], |
| "Removing 2nd fragment" |
| ); |
| </script> |