Continuing the discussion from Why is it not html?:
@saxena_archit The file suffix has no relation to the file content - it’s merely a convention to hint the type of information in the file.
There’s no difference, .html and .htm are both used to refer to text that’s marked up with HTML.
Web servers were initially exclusively UNIX systems with few limitations on the length of file names, and no formal notion of a file name extension. The convention was to use ‘.html’ as the suffix for an HTML file, and the suffix was often used by the web server to set the Content-Type header in the HTTP response.
Eventually, people started creating and even serving up HTML content from Microsoft Windows-based systems. At the time, a 3-letter file name extension was still commonly enforced on files. For that reason, users on Windows shortened ‘.html’ to ‘.htm’.
So, ‘.htm’ is a ‘.html’ file that was generally written by someone using an old Windows environment.
Both .htm and .html are exactly the same and will work in the same way.
The only difference between the two is that .htm is used as an alternate to .html by few servers that do not accept four character extensions. However, operating systems have advanced over years and now, they support long name too.
The extension .html is standard extension for web pages created in HTML Hypertext Markup Language editors. The .htm extension is a variation of the same extension that is supported by Microsoft, that we have made possible to use this extension for your web site files.
By default, the page you’ll see when you visit your web address is “index.html.” If you don’t have an index.html file, their servers will look for a file called “index.htm.” If your web site does not contain either of these files, you will get a warning, and your web site visitors will see an error if they try to visit your web address. If you are not using the standard “index.html,”
source: https://help.luminate.com/kb/web-hosting/difference-index-html-htm-sln20406
The extension .html is a standard extension for web pages created in HTML Hypertext Markup Language editors. The .htm extension is a variation of the same extension that is supported by Microsoft, that we have made it possible to use this extension for your website files.
By default, the page you’ll see when you visit your web address is index.html. If you don’t have an index.html file, our servers will look for a file called index.htm. If your web site does not contain either of these files, you will get a warning, and your web site visitors will see an error if they try to visit your web address. If you are not using the standard index.html
Regards,
Bruce
.html is is the current extension of HTML web pages and files for newer operating systems. Moreover, the .html extension was introduced for security reasons as there were more security threats in the three-letter extension of .htm.
.htm is the older version of the filename extension of HTML language. This extension was used in earlier times as the operating systems were not so powerful to handle four-letter extension. When compared to .html extension the .htm was less secured and hence .html extension came into existence.
HTM and HTML are both file extensions of HTML files. The only difference is that .HTM is used as an alternate to .HTML for some operating systems and servers that do not accept four-letter extensions. Although today, operating systems have developed, and can now support long file names and four-letter file extensions.
thanks