No, but they work best that way.
You can use any extension you'd like to on an HTML file. You just need to be sure that the server is serving the file with the MIME type of "text/html."
XHTML documents use the same HTML extension. They are similar just are more strict than the former.
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.
Yes it is. the xhtml 1.0 to be precise!
That is what seems to be happening already. XHTML is being used more than normal HTML for modern websites, since it forces better cross-browser compatibility -- meaning that multiple browsers viewing the same page should see the same thing. HTML may never fully take over XHTML; however, at this rate, XHTML will be the markup language most commonly used for webpages.
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.
.htm and .html
XHTML documents use the same HTML extension. They are similar just are more strict than the former.
No. HTML existed before XHTML. XHTML combines XML and HTML, so it is an advancement on HTML.
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.
HTML and XHTML are two different languages used for web and application design. XHTML was a popular choice from about the year 2000, to 2011. HTML 5 is intended to replace XHTML. XHTML followed the basic rules of XML-based languages. HTML (both prior and since) do not.
No, XHTML is a parallel language to HTML. XHTML is a XML language definition where tags have similar meanings to corresponding HTML tags. A crude analogy would be that XHTML and HTML are half-brothers; Lot's of similarities but also distinct differences. The successor of HTML is HTML5, the successor of XHMTL is XHTML5.
basikly xhtml is a mics of html and xml. the difference in html and xhtml is that xhtml is a more strict on the syntax and defined as a xml document. xml is a self defined language... in short it is a strikter html in xml format...
HTML is in XHTML, some argue that XHTML is it's own markup
HTTP is not a file, it is a protocol. It therefore does not have an extension. If you mean HTML files, which are web pages, then either htm or html can be used as extensions.
A HTML page is a web page that is created using Hyper Text Markup Language and is saved with a .html extension
Yes, XHTML is just the stricter form of HTML. It means that you have to close all the tags that you have opened.
XHTML is a combination of largely HTML and a small portion of XML.