Add Firefox notes for maction (#17064)
Add Firefox notes for maction (#17064)

* Add Firefox notes for maction

Taken from https://developer.mozilla.org/en-US/docs/Web/MathML/Element/maction#gecko-specific_notes

* Split into several subfeatures, the actiontype=tooltip case is not added since it has never been implemented in any browser and is removed from MathML Core.
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data