XHTML: Frame structure tag

Frame structure tag <frameset></frameset>
Frames allow you to open two or more pages within a single browser window. You can understand it this way: <frameset> is actually a big <table>, but the entire page is the main body of the <table>, and the content of each cell is an independent web page.
Divide the frame into columns ("cols" and "rows" attributes)
Since we say that the frame structure can be understood as a table with a web page as a cell, it must be divided into columns. The cols attribute divides the page into columns, and the rows attribute divides the page into rows. Let’s look at an example.

<html>
<framesetrows="25%,75%">
<framesrc="1.html"/>
<framesrc="3.html"/>
</frameset>
</html>
"rows="25%,75%" means that the page is divided into two rows, because it has two attribute values, and their sizes are 25% and 75% of the page height respectively. Click here to see the display effect of the above code. Frame tag <frame>
The <frame> tag has been used in the above example, and its src attribute is the content to be displayed in this frame. The two frames in this example can be resized by dragging them apart. If you want them to be fixed in size, use the noresize="noresize" attribute.
Note: The <frame> tag is an empty tag and needs to be added with a "/" to comply with XHTML requirements.
About the <noframe> tag <br /> This tag will only work when the browser does not support the frame structure. Since almost all netizens' browsers now support the frame structure, we will not introduce this tag here. If you want to learn more about this, you can check out the HTML manual on the web.
Framework and DTD
The DTD of a frame page is different from that of a normal web page. The declaration method is as follows:
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Frameset//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">

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