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HTML is a presentation language, XML is a data language, JavaScript is a programming language.

HTML is more like Powerpoint, XML like MS-Access.

HTML is like Powerpoint? Wow, if only it was that easy. It's more like Excel IMO if we really want to make such an asinine comparison.

WYSIWTG editors make it easy like Powerpoint. Like the old Frontpage used to do or Blue Griffon: http://bluegriffon.org/

how would I add two numbers in html? <p>1+1=2</p>

<p><script>document.write(1+1);</script></p>

Javascript is not HTML. Both can usefully exist without the other.