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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>
+Transform transition and animation overridden by !important rule create
+a stacking context
+</title>
+<style>
+span {
+ height: 100px;
+ width: 100px;
+ position: fixed;
+ background: green;
+ top: 50px;
+}
+@keyframes Transform100px {
+ from, to { transform: translateX(100px); }
+}
+#test {
+ width: 100px; height: 100px;
+ background: blue;
+ transform: translateX(200px) ! important;
+ transition: transform 100s steps(1, start);
+ animation: Transform100px 100s;
+}
+</style>
+<span></span>
+<div id="test"></div>
+<script>
+window.addEventListener("load", () => {
+ var target = document.getElementById("test");
+ getComputedStyle(target).transform;
+
+ // Change the transform style to 'none'.
+ target.style.setProperty("transform", "none", "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 transform style here should be 'none'
+ // 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>