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<!DOCTYPE html>
<!--
  `reftest-snapshot-all` is necessary to take the screenshot for whole canvas
  when zoom level is changed.
  This is the same as what we do in the case where reftest-async-zoom is
  specified.
 -->
<html class="reftest-wait reftest-snapshot-all">
<meta name="viewport" content="width=device-width, minimum-scale=0.5">
<style>
html {
  overflow: hidden;
}
html, body {
  margin: 0;
  width: 100%;
  height: 100%;
}
div {
  position: absolute;
}
</style>
<div id="red" style="background: red; width: 100%; height: 300%;"></div>
<div id="green" style="background: green; width: 100%; height: 200%;"></div>
<div style="background: blue; width: 100%; height: 100%;"></div>
<script>
document.addEventListener('MozReftestInvalidate', () => {
  green.style.width = '200%';
  red.style.width = '300%';
  requestAnimationFrame(() => {
    document.documentElement.classList.remove('reftest-wait');
  });
});
</script>
</html>