| <!DOCTYPE html> |
| <title>Layout Instability: attribution rectangles pixel units</title> |
| <link rel="help" href="https://wicg.github.io/layout-instability/" /> |
| <style> |
| |
| body { margin: 10px; } |
| #shifter { position: relative; width: 100px; height: 100px; background: blue; } |
| |
| </style> |
| <div id="shifter"></div> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/util.js"></script> |
| <script> |
| |
| strrect = r => `[${r.x},${r.y},${r.width},${r.height}]`; |
| |
| promise_test(async () => { |
| const watcher = new ScoreWatcher; |
| const shifter = document.querySelector("#shifter"); |
| |
| // Wait for the initial render to complete. |
| await waitForAnimationFrames(2); |
| |
| // Modify the position and size of the div. |
| shifter.style = "top: 60px; left: 10px; width: 200px; height: 200px"; |
| await watcher.promise; |
| |
| const sources = watcher.lastEntry.sources; |
| assert_equals(sources.length, 1); |
| |
| const source = sources[0]; |
| assert_equals(source.node, shifter); |
| |
| // Test that attribution rectangles are in CSS pixels |
| assert_equals(strrect(source.previousRect), "[10,10,100,100]", |
| "previousRect should be in CSS pixels"); |
| assert_equals(strrect(source.currentRect), "[20,70,200,200]", |
| "currentRect should be in CSS pixels"); |
| }, "Attribution rectangles should be in CSS pixels."); |
| |
| // Test fractional pixel values |
| promise_test(async () => { |
| const watcher = new ScoreWatcher; |
| const shifter = document.querySelector("#shifter"); |
| |
| // Wait for the initial render to complete. |
| await waitForAnimationFrames(2); |
| |
| // Test with fractional CSS pixel values |
| shifter.style.cssText = 'position: relative; width: 100.5px; height: 75.25px; background: blue;'; |
| await waitForAnimationFrames(2); |
| |
| shifter.style.top = '10.5px'; |
| shifter.style.left = '15.75px'; |
| await watcher.promise; |
| |
| const sources = watcher.lastEntry.sources; |
| assert_equals(sources.length, 1); |
| |
| const source = sources[0]; |
| assert_equals(source.node, shifter); |
| |
| // Test that fractional CSS pixel values are preserved |
| assert_equals(source.previousRect.width, 100.5, "previousRect.width should preserve fractional CSS pixels"); |
| assert_equals(source.previousRect.height, 75.25, "previousRect.height should preserve fractional CSS pixels"); |
| }, "Fractional pixel values should be handled correctly."); |
| |
| </script> |
