window.DOMSettableTokenList | Huge DOM compatibility table

Properties	Chrome	CriOS	Edge	Firefox	Googlebot	IE	Opera	Safari	SamsungBrowser
length	15.0.874	?	?	18.0.0	2.1.0	?	?	4.0.0	?
prototype	15.0.874	?	13.10586.0	18.0.0	2.1.0	10.0.0	?	4.0.0	?
toString	15.0.874	?	?	24.0.0	2.1.0	?	?	4.0.0	?