Add Selection data (#1738)
Add Selection data (#1738)

* adding compat data for Selection

* make suggested changes

* updates to selection

* added subfeatures and made requested changes

* made quick changes

* moved node and offset under modify

mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,teoli2003/browser-compat-data,chrisdavidmills/browser-compat-data