<!DOCTYPE html> <html class="reftest-wait"> <script> const rate = 44100; var context = new window.OfflineAudioContext(1, 512, rate); var buffer = context.createBuffer(1, 128, rate); var source = context.createBufferSource(); source.buffer = buffer; source.start(0, 0, 86400); context.startRendering(). then(function() { document.documentElement.removeAttribute("class"); }); </script>