Analysis and solution of the reason why the frameset tag in HTML cannot be displayed normally

Analysis and solution of the reason why the frameset tag in HTML cannot be displayed normally
<frameset></frameset> is familiar to everyone. It divides a page into several pages like a table, as shown below

Divide a page horizontally into three parts, each with its own scroll bar.
But before displaying the above picture, I tried many methods, but none of them worked. I was very depressed. Later I found out that this tag cannot be placed in the <body> tag.
My code is as follows :

Copy code
The code is as follows:

<html>
<frameset cols="25%,50%,25%">
<frame src="aaa.html">
<frame src="aaa.html">
<frame src="aaa.html">
</frameset>
</html>

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