<!DOCTYPE html> <html class="reftest-wait"> <style> div { width: 100px; height: 100px; background-color: red; } </style> <body> <div id=o_0></div> <script> function boom(){ var anim = o_0.animate([ {}, {"transform": "scale(2)"}, {"transform": "none"} ], { duration: 100, iterationStart: 0.5, }); // We need to wait for finished promise just like we do in 1322291-1.html. anim.finished.then(function() { document.documentElement.classList.remove("reftest-wait"); }); } document.addEventListener("DOMContentLoaded", boom); </script> </body> </html>