Unprefix and update msMatchesSelector() to matches()
Chrome 34+ and Firefox 34+ have updated the their prefixed matchesSelector implementation to just matches. IE should do the same for accordance reasons.
matches() is included in Edge 15, which shipped today (11th April) with Windows 10 Creators Update.
Lukas Oppermann commented
I agree, since it is just a name change it should be rather simple.