Hi,
Yes, it’s a very new command for the OEF interface
from Changelog:
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2015-03-10: add special method mathmlinput (Julien Lyotard)
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Although the pseudo latex command « \input » has been available since the introduction of MathML within WIMS (2012-07-02): but only for « native Mathml » Gecko browsers like Firefox.
Now through the default use of MathJax library it is fairly « crossbrowser ».
kind regards,
Joke