<!DOCTYPE html> <meta charset="UTF-8"> <title>content animation</title> <link rel="help" href="https://drafts.csswg.org/css-content/#content-property"> <meta name="test" content="box-shadow supports animation"> <link rel="author" href="mailto:graouts@apple.com" title="Antoine Quint"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <style> .target::after { content: "default"; } @keyframes content-animation { from { content: "from" } to { content: "to" } } .target.animated::after { animation: content-animation 1s paused linear forwards; } </style> <body> <div class="target"></div> <script> test(function() { const target = document.querySelector(".target"); const style = getComputedStyle(target, "::after"); assert_equals(style.content, '"default"', "Before the animation is applied."); target.classList.add("animated"); const animation = target.getAnimations({ subtree: true })[0]; const testContentAtTime = (time, expected) => { animation.currentTime = time; assert_equals(style.content, `"${expected}"`, `Check the animated value at time = ${time}ms`); }; testContentAtTime(0, 'from'); testContentAtTime(499, 'from'); testContentAtTime(500, 'to'); testContentAtTime(999, 'to'); testContentAtTime(1000, 'to'); }, "The content property can be animated with a discrete animation type."); </script> </body>