<!DOCTYPE html> <html> <head> <style> .box { position: relative; width: 100px; height: 100px; border: 1px solid black; } .middle { visibility: hidden; } .inner { width: 80px; height: 80px; -webkit-animation: spin 5s linear infinite; } @-webkit-keyframes spin { 0% { transform: rotate(0); } 100% { transform: rotate(360deg); } } #transition-tester { position: relative; left: 0; background-color: blue; -webkit-transition: left 1s linear; } #container.animating #transition-tester { left: 20px; } </style> <script src="../../animations/resources/animation-test-helpers.js"></script> <script> const expectedValues = [ // [time, element-id, property, expected-value, tolerance] [0.5, 'transition-tester', 'left', 10, 2], ]; function setupTest() { document.getElementById('container').className = 'animating'; } runTransitionTest(expectedValues, setupTest); </script> </head> <body> <p>Tests that starting an animation on an element inside a visibility:hidden element does not block later transitions.</p> <div id="container" class="container"> <div id="transition-tester" class="box"></div> <div class="middle box"> <div class="inner box"></div> </div> </div> <div id="result"></div> </body> </html>