How to display “Classic” built-up fractions with an horizontal line in CSS / JavaScript?

Question

I have a fraction and I want to display it neatly and nicely.

For example

4/5

would be

4
-
5

I have looked at this and

Answer 1

Use this

6/7​

DEMO

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For straight line

HTML

2
6
​

CSS

.top{border-bottom:solid black 1px; display:inline-block; float:left}
.bottom{ display:inline-block; clear:left; float:left}

​DEMO 2