In the early days of HTML different groups and companies added new element

Why do I have to use these namespace things in XHTML?

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Answer Posted / guest

In the early days of HTML different groups and companies
added new elements and attributes to HTML at will. This
threatened to cause a chaos of different non-interoperable
versions of HTML. XML (the X stands for Extensible) allows
anyone to use elements and elements from different
languages, but for a browser or other user agent to know
which element belongs to which language, you have to tell
it. The namespace declarations do just that.

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