a.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE></HEAD><BODY>
<iframe src=b.html id=bb></iframe><input type=button value=刷新 onclick="document.frames['bb'].document.location.reload();">
</BODY>
</HTML>
b.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE></HEAD><BODY>
<INPUT TYPE="text" NAME="i" value=xxx>
</BODY>
</HTML>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE></HEAD><BODY>
<iframe src=b.html id=bb></iframe><input type=button value=刷新 onclick="document.frames['bb'].document.location.reload();">
</BODY>
</HTML>
b.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE></HEAD><BODY>
<INPUT TYPE="text" NAME="i" value=xxx>
</BODY>
</HTML>
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