Javascript window.open sizes not reliable?

In Safari, why are windows opened via Javascript 2 pixels wider and 1 pixel higher than requested?

I googled for the answer no avail, so made [a simple test page](http://www.twisty.com/misc/tests/safari-window-size/opener.html), and [asked for answers on a (usually quite reliable) local mailing list](http://www.under-score.org.uk/pipermail/underscore/2005-March/035566.html), but haven't got an answer. So, I posted the test page to my [linklog](http://del.icio.us/twisty/required:help) in the hope of it gaining a wider audience. A few hits, but no answer `:-(`.

So: now, I’m re-posting the question here to drizzle a little google-juice on the test page, and hope one of my legion of trusty feed subscribers can spring to my assistance.

I suppose a keyword-stuffed rephrasing of the question could be: Is there reliable cross browser way or technique for opening a fixed-size window via Javascript or with DOM browser scripting (window.open or similar)?

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