paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

dcneiner

Consolidated lists of CSS properties that are inherited by default.
Taken from http://www.w3.org/TR/CSS21/propidx.html
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One item not in the list was "text-decoration" which affects child elements. A few new properties (text-shadow) also affect child elements

List

azimuth
border-collapse