Find pixel value for line height when it's "normal" in Chrome
<p>I have a textarea whose line-height is set to "normal". However, I can still get the actual pixel value in FireFox:</p>

<pre><code>// firefox
&gt;&gt;&gt; $("#post_body").css('line-height')
"19.1167px"
</code></pre>

<p>Whereas I cannot in Chrome:</p>

<pre><code>// chrome
&gt;&gt;&gt; $("#post_body").css('line-height')
"normal"
</code></pre>

<p>How can I get the actual pixel line height in Chrome?</p>
