In \underline{\underline a} MathJax makes the second underline to long, the PNG shows both correctly with equal length.
By the way: You can have a look the examples for all my bugs at http://leuksman.com/mw/index.php/User:Schnark
Version: unspecified
Severity: normal
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Resolved | None | T5840 High resolution equations for printing, Retina displays (hi-dpi) | |||
| Resolved | None | T37200 <math> unreadable on high contrast theme | |||
| Resolved | None | T34096 MobileFrontend image thumbnails, rendered math, etc gets upscaled on iPhone Retina display and hdpi Android | |||
| Invalid | None | T38496 Set $wgDefaultUserOptions['math']=2 on Wikimedia wikis (i.e. enable MathJax by default) | |||
| Declined | Physikerwelt | T65882 [upstream] arrows in MathJax menus point the wrong way in RTL | |||
| Declined | Physikerwelt | T72207 Update to MathJax 2.5.1 | |||
| Declined | Physikerwelt | T37189 MathJax treats double \underline differently as texvc |
Actually, if you look carefully, the 2nd line is actually two lines made up from overlapping −
span 86 was the first underline under a, the 2nd underline is span 87, which looks like this:
<span style="position: absolute; clip: rect(2.318em 1000em 2.839em -0.572em); top: -1.998em; left: 0em; "><span class="mo" id="MathJax-Span-87" style=""><span style="display: inline-block; position: relative; height: 0px; width: 0.89em; "><span style="position: absolute; font-family: MathJax_Main; top: -4em; left: -0.084em; display:none;">−<span style="display: inline-block; width: 0px; height: 4em; "></span></span><span style="position: absolute; font-family: MathJax_Main; top: -4em; left: 0.196em; display:none;">−<span style="display: inline-block; width: 0px; height: 4em; "></span></span></span></span><span style="display: inline-block; width: 0px; height: 2.778em; "></span></span>
I suspect that it is interpreting 'underline a' as two elements and thus underlining both of those elements or something.
It seems that something like \uuline (from the ulem package) would be more appropriate for a MathML conversion.
physik wrote:
Seems to be a problem within MathJax
https://www.mediawiki.org/wiki/Extension:Math/bug/35189