cntrl +s
.htm
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File extensions.
The original extension of a HTML page was .htm because of file name restrictions that limited filetype extensions to 3 characters, today you can use 3 or 4 so either .html or .htm is perfectly fine.
The way Microsoft designed Excel, the program has the ability to save files in HTML format. You just click the Save As option and select .html. MS Excel automatically creates the appropriate HTML code for you.
If you are creating a HTML file, use Notepad or another text editor, not a word processor. When you go to save it, save it with an extension of .htm or .html and set the "Save As Type" option to all files, to ensure a .txt extension is not also added.
go to file menu--> select option "save as" --> then choose the file type "html document" name the file. and you are done