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chromium/third_party/blink/web_tests/fast/forms/datetimelocal/datetimelocal-picker-step2.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>

<input type="datetime-local" value="2019-02-14T13:02" step="2">

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