We need named constants for the values of event.button at least for use internally in both JS and C++. See bug 60703 and bug 70683. I guess the reason we don't have these already is that the DOM spec doesn't have named constants for them (left=0, middle=1, right=2). We should probably contact the DOM WG about making official names for them.
Marking future since we don't have a DOM spec for these right now.
Target Milestone: --- → Future
Assignee: joki → nobody
QA Contact: vladimire → events
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