r">=</span> <span class="token string">'200px'</span> <span class="token comment">// write</span>

foo<span class="token punctuation">.</span>offsetHeight <span class="token comment">// read (recalculate style, layout, expensive!)</span>
bar<span class="token punctuation">.</span>offsetHeight <span class="token comment">// read (fast since style and layout are already known)</span>
baz<span class="token punctuation">.</span>offsetHeight <span class="token comment">// read (fast since style and layout are al