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chromium/third_party/blink/renderer/core/testing/data/viewport-nonzero-values.html 

<html>
  <head>
    <meta name='viewport' content='width=0.1, height=0.01, initial-scale=0.5, minimum-scale=0.0001, maximum-scale=0.999' />
  </head>
  <body>
    A page with the viewport attribute values not set to 0.
  </body>
</html>