layout/reftests/forms/input/number/spinner-overflow-vertical.html


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<!DOCTYPE html>
<meta charset="utf-8">
<style>
  input {
    appearance: none;
    outline: 2px solid black;
  }
</style>
<input type="number" style="writing-mode: vertical-lr">
<input type="number" style="writing-mode: vertical-rl">