JS | From which interface does the addEventListener method comes from in IE?

Question

In modern browsers, the addEventListener property belongs to the EventTarget interface.

According to MDNs compatibility chart - it's being supported starting with IE9, however, I'm not able to access it from either IE9 or 10.

What interface does addEventListener belongs to in IE?

Answer 1

I've made some prototype chain sniffing on Edge/IE console:

IE11: the window object, You have the Window constructor, and Window.prototype.hasOwnProperty('addEventListener') is true.

About html elements: all of them gets it from constructor called Node

Node.prototype.hasOwnProperty('addEventListener') is true. (document.body instanceof Node) === tue

I believe it will be the same for IE9/10

On Edge its different, you do have the EventTarget object that in the prototype chain of html elements & window objects

I wonder if its spec incompatibility from IE side or its considered implementation details