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chromium/android_webview/tools/automated_ui_tests/test/data/webview_scaled.html 

<!DOCTYPE html>
<head>
  <meta name='viewport' content='width=device-width, initial-scale=2.0, minimum-scale=2.0, maximum-scale=2.0'>
  <title>Page with viewport scale 2.0</title>
  <style>
    #select1 {position:absolute;left:0;top:0;}
    #select2 {position:absolute;right:0;top:0;}
    #select3 {position:absolute;right:0;bottom:0;}
    #select4 {position:absolute;left:0;bottom:0;}
  </style>
</head>
<body>
  <select id='select1'>
    <option value='v1'>Value1</option>
    <option value='v2'>Value2</option>
  </select>
  <select id='select2'>
    <option value='v1'>Value1</option>
    <option value='v2'>Value2</option>
  </select>
  <select id='select3'>
    <option value='v1'>Value1</option>
    <option value='v2'>Value2</option></select>
  <select id='select4'>
    <option value='v1'>Value1</option>
    <option value='v2'>Value2</option>
  </select>
</body>