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What is the purpose of the iframe tag in HTML? What is it used for?
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Be careful. <iframe> tags are becoming less common.
I wouldn't use iframes except in really specific cases, because it is nonstandard.
here is the link
However, Google images still uses <iframe> tags.
An <iframe> is used for containing (X)HTML documents in other (X)HTML documents. This enables updates of parts of a website while the user browses, without making them reload the whole thing. (This is now largely replaced by AJAX).
Also, see:
http://w3schools.com/TAGS/tag_iframe.asp
http://en.wikipedia.org/wiki/HTML_element#Frames