> XML is used for organizing.

> XML has a language markup just like HTML, using tags and whatnot.

> The tags are made up by the user (So is a real tag in XML), thus not much
memorization is required.

> XML is commonly used for RSS feeds, and other feeds accepting XML. It is a simple way to streamline news and updates.


~ XML does not "build" like HTML does.

~ XML is just a bunch of tags and words until put into a feed that churns XML into user-friendly data.

~ CSS cannot design XML, since XML does not initially "output" anything but the raw source.

Click here to read HTML vs XHTML


> dHTML is the combination of JavaScript, HTML, and CSS to make dynamic user interfaces, such as web navigation menus and user-friendly maps of a sort.

> dHTML is not a new language, so there's no more memorization needed.


~ dHTML uses JavaScript, which is sometimes disabled on web browsers (And CSS, which could be turned off, but rarely is).

~ Creating a dHTML interface is risky when it comes to browser-compatibility.

~ Many browsers tend to display different things when poorly constructed.

Click here to read HTML vs XHTML


I have mentioned all the important features as well as disadvantages of the above markup languages, even though each has several options, only the real-time website applications choose which one to be used and for what reasons. Choosing a perfect markup language improves a website quality and performance highly.

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