chromium/third_party/blink/web_tests/fast/forms/button-sizes.html

<button style="font-size:5px">Test Button</button>
<button style="font-size:6px">Test Button</button>
<button style="font-size:7px">Test Button</button>
<button style="font-size:8px">Test Button</button>
<button style="font-size:9px">Test Button</button>
<button style="font-size:10px">Test Button</button>
<button style="font-size:11px">Test Button</button>
<input type=button value="Test Button">
<button style="font-size:12px">Test Button</button>
<button style="font-size:13px">Test Button</button>
<button style="font-size:14px">Test Button</button>
<button style="font-size:15px">Test Button</button>
<button style="font-size:16px">Test Button</button>
<button style="font-size:17px">Test Button</button>
<button style="font-size:18px">Test Button</button>
<button style="font-size:19px">Test Button</button>
<button style="font-size:20px">Test Button</button>
<button style="font-size:21px">Test Button</button>