htm vs html which one should be preferred ?

Question

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.htm vs .html

I have seen many static webpages having two variants of file extensions, which one is preferred and why there are two?

Answer 1

It doesn't really matter at all, though HTML is by far the most common.

Answer 2

It doesn't matter, although I would decide for one and stick to it.

Answer 3

Tne 'file extension' htm has been used when filenames had to comply with an 8.3 format: 8 characters and 3 in an extension.

This isn't really necessary any more, unless you're using DOS tools to create web pages.