[WSG] Using valid JavaScript

[Stevio]

I am doing some work which involves resizing objects using JavaScript. 
However, properties like offsetHeight, innerHeight and clientHeight are not 
listed in the references here:
http://www.w3schools.com/

Does that mean the guide at W3Schools is not very good, or that these 
properties are not supported by all browsers?

Is there such a thing as valid, standards compliant JavaScript? Where can I 
find a reference guide of JavaScript properties that are supported across 
all browsers?

What I am specifically trying to do is find out things like the height of 
the body and the height of particular elements within the page. Any 
suggestions or ideas welcome.

Sorry if this is a bit off topic. (Is it?)
Stephen 


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