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HTML 4.01 Transitional is an HTML standard that allows for the continued use of some earlier HTML tags that were deprecated in the 4.01 standard.
Those tags were:
The idea behind the transitional doctypes is to allow developers time to move into the strict doctype (porting old code, waiting for browsers to support new methods, etc.)
You're allowed to use these old tags in an HTML document declared as 4.01 Transitional, but using them in an HTML 4.01 Strict document will cause the W3C's validator to throw an error.
It's important to note that the point of deprecation is to discourage use of tags, normally with the intent that the tags will be removed entirely in a future release. Sometimes, for one reason or another, a deprecated tag is rescued from the scrap heap (for instance,