| <!DOCTYPE html> |
| |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <script src="../resources/testharness.js"></script> |
| <script src="../resources/testharnessreport.js"></script> |
| <style> |
| #container { |
| position: relative; |
| width: 400px; |
| height: 100px; |
| border: 1px solid black; |
| } |
| #box { |
| position: absolute; |
| left: 0px; |
| height: 100px; |
| width: 100px; |
| background-color: blue; |
| transition-duration: 1s; |
| transition-timing-function: linear; |
| } |
| </style> |
| </head> |
| <body> |
| |
| <div id="container"> |
| <div id="box"> |
| </div> |
| </div> |
| <script> |
| 'use strict'; |
| |
| // It may take a number of frames before the property updates. |
| // https://bugs.chromium.org/p/chromium/issues/detail?id=679981 |
| function waitForProgress() { |
| var initialLeft = getComputedStyle(box).left; |
| return new Promise(resolve => { |
| function poll() { |
| var currentLeft = getComputedStyle(box).left; |
| if (currentLeft === initialLeft) { |
| requestAnimationFrame(poll); |
| } else { |
| resolve(); |
| } |
| } |
| requestAnimationFrame(poll); |
| }); |
| } |
| |
| async_test(t => { |
| box.offsetTop; // Force style recalc |
| box.style.left = '300px'; |
| box.style.opacity = 0.5; |
| var previousLeft; |
| waitForProgress().then(() => { |
| previousLeft = getComputedStyle(box).left; |
| box.style.left = '0px'; |
| }).then(waitForProgress).then(t.step_func_done(() => { |
| var currentLeft = getComputedStyle(box).left; |
| assert_less_than(parseFloat(currentLeft), parseFloat(previousLeft)); |
| })); |
| }, 'Box should start moving left after left style is reset'); |
| </script> |
| </body> |
| </html> |
