MathJax and the hover event - mathjax

Question

I'm finding MathJax a superior alternative to MathML. However, I'm having some trouble getting MathJax to render while using a :hover event in my CSS:
span.rollover span {
display: none;
position: absolute;
background-color: white;
padding-left: 7px;
padding-right: 7px;
border: 1px solid red;
color: navy;
font: 1em "Computer Modern", "Computer Modern Roman", "Latin Modern", "Cambria Math", serif;
text-decoration: none;
border-radius: 10px 10px 10px 0;
opacity: 0.9;
text-align: center;
vertical-align: middle;
white-space: nowrap;
line-height: 150%;
}
span.rollover:hover span {
display: initial;
top: -30px;
z-index: 50;
}
At the moment it's displaying garbage; a current draft of the page can be found here. Here's an example of the problem:
<span class="rollover">Initial angle<span>0.0 ≤ $\theta_0$ ≤ 1.6 rad</span></span>
Is there a way to force MathJax to render the markup for such an event?

Answer 1

Your CSS is too aggressive: it applies to every span within your rollover spans. Since MathJax uses spans to lay out the mathematics, it applies to those, and so you are forcing the position, border, top, etc. for every element used by MathJax. That means you are moving the math content out of place, and giving it borders, and so on (this account for some of the extra elements that appear above the ones you expect.
If you change
span.rollover span {
...
}
span.rollover:hover span {
...
}
to
span.rollover > span {
...
}
span.rollover:hover > span {
...
}
so that these styles only apply to the top-level child spans (rather than every span), that should do it for you.