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chromium/tools/perf/page_sets/tough_animation_cases/css_value_type_length_simple.html 

<!DOCTYPE html>
<meta name="viewport" content="width=device-width, user-scalable=no">
<link rel="stylesheet" type="text/css" href="resources/tablet.css">
<style>
target {
  position: relative;
}
</style>
<script src="resources/perf_test_helper.js"></script>
<script src="resources/css_value_type.js"></script>

<container id="container"></container>

<script>
perfTestCSSValue({
  property: 'left',
  from: '-100px',
  to: '100px',
});
</script>