Test of getElementById()

Yet another test of getComputedStyle() & IE "alternatives"
ECMA	`getComputedStyle()`
IE5	`object.style.pixelHeight`
IE5a	`document.body.offsetHeight`
IE5b	`document.documentElement.offsetHeight`
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prev test: maxX = parentX

Yet another test of getComputedStyle() & IE "alternatives"