On page, we have installed <iframe /> tags, for example:
<iframe src="iframe1.html">content iframe1</iframe>
<iframe src="iframe2.html">content iframe2</iframe>
After some action on page, or reload page, on click back button we have:
<iframe src="iframe1.html">content iframe2</iframe>
<iframe src="iframe2.html">content iframe1</iframe>
So, we have a web site, on our web site we have <iframe /> tags, for example:
<HTML>
<HEAD>
<TITLE>Frame Test</TITLE>
</HEAD>
<BODY>
<H1>This is the parent page</H1>
<IFRAME SRC="frame1.html"></IFRAME>
<BR />
<IFRAME SRC="frame2.html"></IFRAME>
<BR />
<A HREF="page2.html">Page 2</A>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE>Frame 1</TITLE>
</HEAD>
<BODY>
<H2>This is frame 1</H2>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE>Frame 2</TITLE>
</HEAD>
<BODY>
<H2>This is frame 2</H2>
</BODY>
</HTML>
<HTML><HEAD>
<TITLE>Page 2</TITLE>
</HEAD>
<BODY>
<H2>This is page 2</H2>
</BODY>
</HTML>