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Well, using pure HTML means that the webpage will be only static and you can't use nice features of various web development frameworks. Any complex project will be hard to manage using only HTML.
HTML is used for presentation; scripting and spreadsheets are used for interacting with the website in dynamic ways.
It's static and ugly without the help of a scripting language to make it dynamic and CSS or something else to make it beautiful..., etc. It's the standard of Web, so it can be important, but there are great tools nowadays that pretty much does almost everything for you so you won't get to hate it so much. :) HTML5 is much better for several reasons. I suggest to get a book for it and prepare if Web development is your goal.
Just say that there's no disadvantage for HTML. It is a self-contained tool that cannot be replaced. It has a specific goal: being used for presentation. Saying disadvantage implies you're asking for a potential replacement tool for HTML for the same job. NO THERE'S NO REPLACEMENT.
thankx all of u
@toussainr HTML could easily be replaced, you could build a substantial website in pdf, and there are enormous disadvantages to using HTML. We use it because the benefits normally outweigh the costs many times over. Screaming "NO THERE'S NO REPLACEMENT" at the guy seems a little bit extreme.
I've given mowrey a medal, I think he provided the best answer to the question asked (and gentoolx already got a medal anyway).
not dynamical unless incorporated with xml