| <!DOCTYPE html> |
| <title>CSS Transitions Test: @starting-style inside size @container</title> |
| <link rel="help" href="https://drafts.csswg.org/css-transitions-2/#defining-before-change-style-the-starting-style-rule"> |
| <link rel="help" href="https://drafts.csswg.org/css-conditional-5/#animated-containers"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/css/css-transitions/support/helper.js"></script> |
| <body> |
| </body> |
| <style> |
| #container { |
| container-type: inline-size; |
| width: 100px; |
| } |
| #target { |
| transition-property: background-color; |
| transition-duration: 100s; |
| transition-timing-function: steps(2, start); |
| background-color: lime; |
| display: none; |
| } |
| @container (width > 300px) { |
| @starting-style { |
| #target { background-color: white; } |
| } |
| } |
| @container ((width > 200px) and (width < 300px)) { |
| #target { |
| display: block; |
| } |
| @starting-style { |
| #target { background-color: white; } |
| } |
| } |
| @container (width < 200px) { |
| @starting-style { |
| #target { background-color: red; } |
| } |
| } |
| </style> |
| <script> |
| function setup(test) { |
| let container = document.createElement("div"); |
| container.id = "container"; |
| document.body.appendChild(container); |
| |
| let target = document.createElement("div"); |
| target.id = "target"; |
| container.appendChild(target); |
| |
| test.add_cleanup(() => { |
| target.remove(); |
| container.remove(); |
| }); |
| return [container, target]; |
| } |
| |
| promise_test(async t => { |
| let [container, target] = setup(t); |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).backgroundColor, "rgb(0, 255, 0)", |
| "No transition while display:none"); |
| container.style.width = "400px"; |
| target.style.display = "block"; |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).backgroundColor, "rgb(128, 255, 128)", |
| "@starting-style based on the size query evaluation from " + |
| "the same frame"); |
| }, "Triggered transition from first style update based on up-to-date " + |
| "container query"); |
| |
| promise_test(async t => { |
| let [container, target] = setup(t); |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).backgroundColor, "rgb(0, 255, 0)", |
| "No transition while display:none"); |
| container.style.width = "250px"; |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).backgroundColor, "rgb(128, 255, 128)", |
| "@starting-style based on the size query evaluation from " + |
| "the same frame"); |
| }, "Triggered transition from the display change inside the up-to-date " + |
| "container query"); |
| </script> |
