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From: "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups: comp.lang.javascript
Subject: Re: addeventlistener quirks
Date: Sun, 25 Jan 2015 15:16:58 +0100
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Thomas 'PointedEars' Lahn wrote:

> Christoph M. Becker wrote:
> 
>> It seems that IE 11 in IE 9 emulation mode does define the
>> `addEventListener` property of window and elements, 
> 
> <http://ie.microsoft.com/testdrive/ieblog/2011/Mar/24_IE9sDocumentModesandJavaScript_1.png>
> 
> “Quirks mode” is not the same as “IE 9 standards” Document Mode, and 
> certainly IE 11 in “IE 9 standards” Document Mode is not the same as IE 9 in 
> “Quirks mode”.
> 
> IE 9 in “Quirks mode” is lower in regard to standards compliance than “IE 7 
> standards” Document Mode.  addEventListener() certainly is not available 
> there.

Of course, you're right.  I was confused about the value of
document.compatMode, which I thought would be "CSS1Compat" for quirks
mode, while actually it is "BackCompat".  However, as I've just learned[1]:

| As of Internet Explorer 10, quirks mode behaves differently than it
| did in earlier versions of the browser. In Windows Internet Explorer
| 9 and earlier versions, quirks mode restricted the webpage to the
| features supported by Microsoft Internet Explorer 5.5. In Internet
| Explorer 10, quirks mode conforms to the differences specified in the
| HTML5 specification.

> This fits well with official information that support for IE 8 will be 
> discontinued, and for IE 9 and 10 reduced, starting next year:

I'm afraid that IE 8 will stay in widespread use as long as Windows XP does.

[1] <https://msdn.microsoft.com/en-us/library/cc288325(v=vs.85).aspx>

-- 
Christoph M. Becker