p 元素的字体大小 12px ；行高 12px ；
内嵌 span 元素，字体大小 24px ；
这个 16px 是怎么算出来的？
<p style="font-size: 12px; line-height: 12px;border: 1px solid black;">
which is
<span style="font-size: 24px;">strongly emphasized </span>
and which is </p>
Can I use?
› http://caniuse.com/
Less
› http://lesscss.org
Cool Libraries
› Bootstrap from Twitter
› Jetstrap
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