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chromium/third_party/blink/web_tests/external/wpt/infrastructure/assumptions/min-font-size.html 

<!doctype html>
<title>Check 1px and 2px font-sizes are different</title>
<link rel="mismatch" href="min-font-size-ref.html">
<style>
p {
  font-size: 1px;
}
</style>
<p>Tiny text