<html>
<body>
<a href="b.html">link</a>
<br>
<iframe id='subframe'></iframe>
<script src="a.js"></script>
</body>
</html>
<html>
<body>
<a href="b.html">link</a>
<br>
<iframe id='subframe'></iframe>
<script src="a.js"></script>
</body>
</html>