<!DOCTYPE html>
<html>
<body>
<input id="emptyOnFirstVisit" value="visited">
<form action="data:text/html,&lt;script>history.back()&lt;/script>" id=form1>
    <input type=week id=input1>
    <input type=week id=input2 value="2001-W02">
    <input type=week id=input3 value="2002-W03">
</form>
</body>