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

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="minimum-scale=2.0">
<style>
select {
  position: absolute;
  left: 320px;
  top: 800px;
  width: 100px;
  height: 20px;
}
</style>
</head>
<body>
<select><option>abc</option></select>
</body>
</html>