chromium/third_party/blink/renderer/core/testing/data/viewport-initial-scale-1.html

<html>
  <head>
    <meta name='viewport' content='initial-scale=1.0' />
  </head>
  <body>
    A page with a viewport set to initial-scale 1.
    <div style="width:1000px">Very wide div</div>
  </body>
</html>