chromium/third_party/blink/web_tests/fast/forms/password/password-eye-icon-zoom-4x.html

<input type="password" id="passwd" style="zoom:4;">

<script>
    // This verifies the eye icon scales correctly with different zoom level. (zoom: 4x)
    document.getElementById("passwd").focus();
    eventSender.keyDown('a');
</script>