Does the web browser fulfill the "xmlns" attribute?

Question

At W3schools, the XML Namespace article reads:

Note: The namespace URI is not used by the parser to search for information.

I have a very simple XML file:

<?xml version="1.0" encoding="utf-8"?>
<foo> 
    <bar>Hi!</bar>
    <button xmlns="http://www.w3.org/1999/xhtml">Click Me!</button>
</foo> 

Opening this file in Chrome or Firefox displays an HTML button (not in IE). Does this mean that some browsers process XMLNS? Is this one of these extra features great browsers for the common XHTML namespace?

Just curious!

Answer 1

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