frameset、frame は共に非推奨です。
別ページを読み込む場合は iframe を使います。
【<frameset> - HTML | MDN】
https://developer.mozilla.org/ja/docs/Web/HTML/Element/frameset
非推奨
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.
【<frame> - HTML | MDN】
https://developer.mozilla.org/ja/docs/Web/HTML/Element/frame
非推奨
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.
こういう感じでしょうか。
HTML
1<iframe src="example.com" frameborder="0"></iframe>
2<iframe src="example.com" frameborder="0"></iframe>
3<iframe src="example.com" frameborder="0"></iframe>
4<iframe src="example.com" frameborder="0"></iframe>
5<iframe src="example.com" frameborder="0"></iframe>
6<iframe src="example.com" frameborder="0"></iframe>
7<iframe src="example.com" frameborder="0"></iframe>
8<iframe src="example.com" frameborder="0"></iframe>
9<iframe src="example.com" frameborder="0"></iframe>
CSS
1html, body, iframe {
2 margin: 0;
3 padding: 0;
4 overflow: hidden;
5}
6html, body {
7 height: 100vh;
8 width: 100vw;
9}
10body {
11 display: flex;
12 flex-wrap: wrap;
13}
14iframe {
15 flex: 1 1 33%;
16}
17```**動くサンプル:**[https://jsfiddle.net/m39prv0x/](https://jsfiddle.net/m39prv0x/)
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