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MDN explains how to use the window.screen object, but also says "DOM Level 0. Not part of specification."
W3Schools says that window.screen.* properties are supported in all major browsers.
If I understand this correctly... window.screen is completely non-standard, but is nonetheless universally supported. Is that right?
If this is the case, are there any cross-browser differences I need to be aware of, or can I just use it? I'm mostly interested in screen.availWidth, by the way.
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Quirksmode compatibility tables to the rescue!
http://www.quirksmode.org/dom/w3c_cssom.html#screenview
Most, but not all values are supported by the major browsers.
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You should be fine with it.
The reason that it is not part of a standard is because DOM Level 0 was introduced before standards were around. DOM Level 0 is also called the Legacy DOM, and it was created at the same time NetScape 2.0 made JavaScript in the browser a reality; in effect, DOM Level 0 was the very first DOM spec.
The Legacy DOM will be around for a long time, if not then it would break backward compatibility with a TON of very popular scripts already in existence.
EDIT: In other words, your understanding is completely correct. It is not "standardized" but it is completely universal and will remain so for a long time.
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