HTML5 iframe in HTML4 document

Question

Is it possible to include iframe with HTML5 format inside HTML4 document? Then, will HTML5 features work as expected? Or, will root document restrict the HTML5 features?

score 2 · Accepted Answer · edited May 23 '17 at 12:03

2

The doctype declaration will not restrict the elements if the browser needs to support the element.

https://html5test.com/results/desktop.html Source: HTML 4 Iframe with HTML5 content

So, answering your questions:

Yes it is possible to do this.
Yes all features will work, if the browser supports it.
No there will be no restrictions because of the document.

edited May 23 '17 at 12:03

Community

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answered Oct 22 '15 at 18:23

Steyn

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Thanks! I thought there was no post on this. Thanks for the reference! – Byungchan An Oct 26 '15 at 18:02

score 0 · Answer 2 · answered Oct 22 '15 at 18:23

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Normally, it will be. Frame rendering is independent of the parent page, so I think you will be able to load almost any page, even HTML5, in a frame on a root page with an older !DOCTYPE.

answered Oct 22 '15 at 18:23

André-Luc Huneault

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HTML5 iframe in HTML4 document

2 Answers2