Internet Explorer "Quirks mode"

[sbwMikael]

Hello,

All is well when Internet Explorer (9 in my test case) is running in Standards Mode. But when I create a page that triggers "Quirks mode", the interpreter complains:

Object doesn't support property or method 'addEventListener'

I'm writing a browser plugin that injects some script into the page, so I don't have any control over the page doctype declaration (or lack thereof). This is a scenario my plugin is quite likely to encounter at some point.

I note that on the MDN page for "addEventListener", a polyfill is provided with the caveat:

Also note that this IE8 polyfill ONLY works in standards mode: a doctype declaration is required

So that seems to be the same issue. I'm not sure how to work around this at the moment.