| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546 |
- <!DOCTYPE html>
- <html class="reftest-wait">
- <title>
- Opacity transition and animation overridden by !important rule creates a
- stacking context
- </title>
- <style>
- span {
- height: 100px;
- width: 100px;
- position: fixed;
- background: green;
- top: 50px;
- }
- @keyframes Opacity0 {
- from, to { opacity: 0; }
- }
- #test {
- width: 100px; height: 100px;
- background: blue;
- opacity: 0 ! important;
- transition: opacity 100s steps(1, start);
- animation: Opacity0 100s;
- }
- </style>
- <span></span>
- <div id="test"></div>
- <script>
- window.addEventListener("load", () => {
- var target = document.getElementById("test");
- getComputedStyle(target).opacity;
- // Change the opacity style to 100%.
- target.style.setProperty("opacity", "1", "important");
- // Important style is changed but there is a CSS animation,
- // so transition won't be visible and the CSS animation is overridden by
- // the !important rule. As a result opacity style here should be 100%
- // specified by the important rule, but we should create a stacking
- // context for it because there are animations.
- requestAnimationFrame(() => {
- document.documentElement.classList.remove("reftest-wait");
- });
- });
- </script>
|
