# How to do a underbracket with Mathjax?

This is the formula that shall be achieved:

The code from TeX:

\underbracket[0.5pt][5.pt]{78\,255\,300,00}_{10\text{ zählende Ziffern}} \\[10pt]
0,000\,\!\!\!\!\!\!\!\!\underbracket[0.5pt][5.pt]{420\,800}_{6\text{zählende Ziffern}}

With Mathjax it does not work, obviously underbracket is not available.

If you propose a solution, please try to focus on the basic mathjax, not plugins. Thank you for your help.

• How about using \underbrace? May 17 '16 at 11:56
• Is this a question about usage on this site? If it is a general MathJax question this site is not the right one to ask about it.
– quid Mod
May 17 '16 at 12:24
• To add to @quid: it's relatively easy to add a macro for \underbracket to your own site but it's hard to do so on math.SE (since it requires deeper hooks into MathJax that \newcommand etc do not expose). May 17 '16 at 13:54
• @quid: I wanted to ask on math.stackexchange.com but there is no mathjax tag. May 17 '16 at 16:23
• It is good you did not ask on math.stackexchange.com, as it would be very off topic there. If anything you might ask it on Stack Overflow, which has MathJax tag stackoverflow.com/questions/tagged/mathjax I am not certain about this though. Maybe @PeterKrautzberger knows.
– quid Mod
May 17 '16 at 17:34
• TeX.SE has a MathJax tag; that's probably the best place to ask this. May 17 '16 at 20:20
• @DylanSp no it's not. MathJax is by and large off-topic on TeX - LaTeX site.
– quid Mod
May 18 '16 at 8:09
• @quid: Per the mathjax tag wiki on TeX.SE, and the linked meta post(s), I believe this specific type of question (i.e. how to achieve something using the limited subset of (La)TeX available in MathJax) would be considered marginally on-topic there. Questions about installing and configuring MathJax on a website would be off-topic, however. May 18 '16 at 14:35
• @IlmariKaronen I do not claim expertise on the OT of that site yet these three recent examples seem somewhat like the question here; closed1, closed2, closed3 (Meybe the second is a bit different, but still.)
– quid Mod
May 18 '16 at 20:02

$$\mathop{\underset{\mmlToken{mo}{⎵}}{78\,255\,300,00}}\limits_{10\text{ zählende Ziffern}}$$
• Thanks a lot. Second example is then: $$\mathop{\text{0,000} \underset{\mmlToken{mo}{⎵}}{420800}}\limits_{\text{ 6 zählende Ziffern}}$$ May 18 '16 at 14:55
• I might use 0,000\,\mathop{\underset{\mmlToken{mo}{⎵}}{420\,800}}\limits_{\hskip-2em 6\text{ zählende Ziffern}\hskip-2em} to get more like your original instead: $$0,000\,\mathop{\underset{\mmlToken{mo}{⎵}}{420\,800}}\limits_{\hskip-2em 6\text{ zählende Ziffern}\hskip-2em}$$ though this does mean the expression sticks out on the right. That may or may not be a problem. May 18 '16 at 18:25