When I inspect webpages and want to adjust elements whose font-size value are in percentage or `em`, I always have to go through their ancestors to find out on whom those percentage values are based on. Since this scenario happens a lot in my life, I am trying to write some code to make things easier. But the problem is, jQuery's .css() method is only getting computed values, like below.

1. how do I get an element's exact CSS value as in CSS files or `style` tag?
2. Is there any function which works like .offsetParent() and can achieve my original goal? **EDIT:** For clarification, I want to find the nearest ancestor whose font-size property is set in `px`. Like .offsetParent(), which can find the nearest ancestor that is 'positioned'.
3. An off-topic question: in the fiddle below, why is the computed value 19.2000007629395 instead of 19.2 which equals to 16\*120%?

jsfiddle: <http://jsfiddle.net/yae8qn70/>

HTML:

```
<div class='a'>
    <div class='b'>120% font</div>
</div>
Result:<span class='r'></span>

```

css:

```
.a{font-size:16px}
.b{font-size:120%}

```

Js:

$('.r').text($('.b').css('font-size'))