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HTM or HTML?
What is the difference between HTM and HTML extensions on web pages?
A question often asked, thus an answer to provide.

The obvious answer is in the spelling. There is an L or lack thereof. Other than that small difference, the two documents types are exactly the same. Both types may be used the same (on most host servers) and both will be rendered the same in browsers.

There is one area of concern though, most host servers will require your default starting page to be named as "index.html" and not as "index.htm". Although that will also vary depending on your host and their setup.

Should you use HTM instead of HTML or vice versa? That depends on your preference. What looks better to you?

There are references back and forth about the origin of HTM being created on a DOS/Win3.x platform and then grew into HTML as operating systems became more powerful. Is it true? I don't know. I guess it depends on who you talk to at the time. These days there are an extensive number of different extension types that include 3, 4, up to 8 characters! We won't go into a list of them and thier differences though :)

So... the end result is... there is no difference between HTM and HTML except for one letter.
HTM or HTML?
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