window.UserActivation.length | Huge DOM compatibility table

Browser	Version	Own?	Type	As String
BingPreview	1.0.0	?	?	?
Chrome	49.0.2623	?	?	?
Chrome	76.0.3809	own	number	0
Chrome	83.0.4096	?	?	?
Chrome	84.0.4147	own	number	0
Chrome	85.0.4183	?	?	?
Chrome	86.0.4240	own	number	0
Chrome	90.0.4400	?	?	?
Chrome	90.0.4408	own	number	0
Chrome	90.0.4409	?	?	?
Chrome	90.0.4414	own	number	0
Chrome	90.0.4425	?	?	?
Dalvik	2.1.0	?	?	?
Edge	85.0.564	own	number	0
Edge	87.0.664	?	?	?
Edge	88.0.670	own	number	0
Edge	89.0.736	?	?	?
Extension	19.0.0	?	?	?
fetch	1.0.0	?	?	?
Firefox	3.5.2	?	?	?
HeadlessChrome	76.0.3803	?	?	?
IE	10.0.0	?	?	?
MTRobot	0.2.0	?	?	?
Preview	0.5.0	?	?	?
Safari	4.0.0	?	?	?
SamsungBrowser	13.0.0	own	number	0
SFive	80.0.0	own	number	0
XC	1.4.0	?	?	?
YandexBot	3.0.0	own	number	0
zgrab	0.0.0	?	?	?

Properties	BingPreview	Chrome	Dalvik	Edge	Extension	fetch	Firefox	HeadlessChrome	IE	MTRobot	Preview	Safari	SamsungBrowser	SFive	XC	YandexBot	zgrab