CommonHTML fraction rendering results in overlap with surrounding punctuation

Created by: barillax

Test cases:

Here's a fraction $ \dfrac{11}{100} $. Here's a fraction $ \dfrac{11}{100} $!

Notice that the punctuation ending the sentence will overlap with the fraction due to the position: absolute fraction bar not contributing to the width of MathJax span.

There are ways to hack around this, such as manually inserting \space onto the end of the MathJax, but it wasn't necessary in the HTML-CSS processor previously. Suggestions for better workarounds are welcome!