Arrows <=>> and <<=> are not strechy

[david15566]

Hi all!
I having some troubles with the mhchem arrows.
If I write some code like:
\ce{<=>[{some text}][{Some text}]} --> Mathjax bring me a little arrow not adjusted with the text.

With other arrows:
\ce{<=>>[{some text}][{Some text}]}
\ce{<<=>[{some text}][{Some text}]}
Both of them bring me the same arrow like the example below (\ce{<=>}) instead of the correct arrow.

I write this using the documentation available at ftp://www.ctan.org/tex-archive/macros/latex/contrib/mhchem/mhchem.pdf

[mhchem]

Hi david1566!

First of all, please refer to the MathJax/mhchem documentation and not the LaTeX/mhchem one.

The non-strechiness of <=>> and <<=> is a feature request towards MathJax. mathjax/MathJax#1491