it think the versions are
HTML 1.0
HTML 2.0
HTML 3.0
HTML 3.2
HTML 4.01
xhtml 1.0
and now HTML 5
The different versions are used to characterize changes in the HTML itself. With new features and new tags come new versions. In the modern web, (HTML 4+) the versions are also the basis for laying out standards that describe the function of the HTML and how the browsers are supposed to display it.
For instance, prior to HTML 2.0, there were no images available in HTML.
If you're interested, the W3C (World Wide Web Consortium) is in charge of keeping the current HTML and XHTML standards. You can find the specific changes in versions on their website.
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In HTML, the <!DOC TYPE> means the type of HTML coding you are using. There are many different versions of HTML. This part of the code tells the web-browser how to format the page.
Advanced HTML code includes features like authentication. It authenticates any input type field in code.
Most browsers supports previous versions of HTML. Many websites are still using HTML 4.01 or older, so back compatibility is very necessary.
HTML has various versions accourding to functionality. The latest one HTML5 is the most stable.
HR tag places a break between the page in HTML. It is however not supported in the modern versions.