IE 7/8 shows a JavaScript error in editor_js()

[SergeyBiryukov]

Message: Object doesn't support this property or method 
Line: 909
Char: 5
Code: 0
URI: http://trunk.wordpress/wp-admin/edit-comments.php

The line that causes this is:

el = document.getElementsByClassName('wp-editor-wrap');

Introduced in [22007].

To reproduce, just visit the Dashboard or Comments screen.

Patch for ticket 22053

This is because getElementsByClassName is only available in HTML5. IE8 only partially supports HTML5, getElementsByClassName is not supported as you can see here: ​http://caniuse.com/#search=getelementsbyclassname. I've made a patch for this. When getElementsByClassName is available, the script will use that, otherwise it will use the fallback document.querySelectorAll('.wp-editor-wrap');

Fixed dannydehaan's patch, getElementByClassName should be getElementsByClassName

With proper formatting

22053-2.diff​ fixes the error in IE 8, but not in IE 7, which doesn't support querySelectorAll(): ​http://caniuse.com/queryselector

I also see (probably unrelated) "Error: 153 Unspecified Error" without any details on every admin screen in IE 7. Not sure how to debug that. Perhaps there's an issue with my standalone IE 7 install, however I don't remember seeing that in 3.4.

I've made a jQuery solution so it will work in all browsers, couldn't find anything with better performance that could fix this issue. What i do see is that the editor becomes visible after clicking HTML, then back to visual, so it's not directly visible, i don't know if this should be the behaviour?

About your other "Error", i can't see it in Internet Explorer 7 or 8. I'm using a virtual machine with Windows XP and Utilu IE Collection, so it could be that.

This was fixed in [22251]. Sorry, forgot to close this ticket with the commit.