2.1.23 [ECMA-262/5] Section 188.8.131.52, Array.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
NOTE The lastIndexOf function is intentionally generic; it does not require that its this value be an Array object. Therefore it can be transferred to other kinds of objects for use as a method. Whether the lastIndexOf function can be applied successfully to a host object is implementation-dependent.
IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)
The lastIndexOf method can be applied to a host object; however, some host objects may reject such an application.