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chromium/third_party/blink/web_tests/fast/forms/calendar-picker/week-picker-appearance-step.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../resources/picker-common.js"></script>

<!-- Check if step attribute is reflected in the appearance of the calendar picker.  -->
<input type="week" min="2008-W07" value="2010-W12" max="2010-W12" step="3">

<script>
  window.onload = openPickerAppearanceOnly(document.querySelector('input'));
</script>