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X Marks the Spot

Look closely at the official progress of HTML and related markup languages, and you'll see a lot of X's popping up. This notorious X represents a fundamental concept in the way many Web languages are evolving.

The concept is extensibility. Extensible languages are unlimited in terms of their capability to be customized to specific needs yet still understood by the broadest range of user agents as possible. Extensibility allows languages to stretch within the contextual rules of the language and self-define the behavior of a given piece of syntax.


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