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How to verify, which version of MathJax is used here? It seems that v. 2.5 is not implemented yet. It has very useful features, as \delimiterfactor, which is needed here: https://tex.stackexchange.com/questions/284809/getting-large-braces-in-mathjax

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MathJax does not implement the \delimiterfactor control sequence, but does have an internal value for delimiterfactor (the default value of 901 from TeX) that it uses in its computations for stretchy delimiters. That value can be set from Javascript, but not from within a TeX expression. One reason for this is that MathJax doesn't implement the localization of changes within braces, so changes to \delimiterfactor would be global.

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  1. Right-click any formula, like this one: $\int_0^1 e^x\,dx$
  2. Choose "About MathJax"
  3. You will see the version. Currently MathJax v2.6.0-beta.2
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  • $\begingroup$ Thank you! +1 now and will be accepted after some period, if no better answer appear. $\endgroup$ – Przemysław Scherwentke Dec 27 '15 at 6:38
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    $\begingroup$ This doesn't answer your question about \delimiterfactor, though. I looked around and could not find any details or examples about its use in MathJax. It just doesn't seem to be recognized. I don't know, but this might be a regression in 2.6 beta. $\endgroup$ – user147263 Dec 27 '15 at 6:45
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    $\begingroup$ So, I retagged your question as a bug and I suggest not accepting any answer until the situation is clear. $\endgroup$ – user147263 Dec 27 '15 at 6:47

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