layout/reftests/web-animations/style-updates-on-current-iteration-changed.html


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<!DOCTYPE html>
<html class="reftest-wait">
<title>Update styles when current iteration changed</title>
<script src="animation-utils.js"></script>
<style>
#test {
  width: 100px; height: 100px;
  background: blue;
}
</style>
<div id="test"></div>
<script>
  var anim = document.getElementById("test")
    .animate({ marginLeft: [ "0px", "100px" ] },
             { duration: 100000,
               delay: -99999, // For starting right before second iteration.
               easing: "steps(1, start)",
               iterations: 2,
               iterationComposite: "accumulate" });

  waitForIterationChange(anim).then(() => {
    // Wait for painting the result of the second iteration.
    document.documentElement.classList.remove("reftest-wait");
  });
</script>