chromium/chrome/test/data/form_interaction.html

<html>
<head>
<title>Form interaction test</title>
<script type="text/javascript">
// For some navigations (Back forward cache and prerenders), the focus from the
// autofocus tag is lost and focus must be explicitly re-added.
function FocusTextField() {
  document.getElementById("value").focus();
}
</script>
</head>
<body>
<form action="">
<!-- A single text field that is focused. -->
<input type="text" name="q" id="value" value="test" autofocus/>
</form>
</body>
</html>