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chromium/third_party/blink/web_tests/inspector-protocol/resources/set-scrollbars-hidden.html 

  <html>
    <style>
      html, body, div.outer {
        margin: 0;
        padding: 0;
        height: 1000px;
        overflow: hidden;
      }
      body {
        padding-right: 20px;
      }
      div.outer {
        overflow: auto !important;
      }
      div.inner {
        height: 10000px;
        width: 100%;
        margin: 0;
      }
    </style>
    <body><div class=outer><div class=inner></div></div></body>
  </html>