Safari 7:

https://www.mediawiki.org/wiki/Communication?veaction=edit

Copy from under H1, including template up to just before the Chat header. I get:
[Error] TypeError: 'undefined' is not an object (evaluating 'delete children[i].values[attribute]')
removeAttributeRecursive (load.php, line 20)
removeAttributeRecursive (load.php, line 20)
removeAttributeRecursive (load.php, line 20)
removeAttributeRecursive (load.php, line 20)
removeHtmlAttribute (load.php, line 20)
getClonedElement (load.php, line 202)
cloneElements (load.php, line 170)
onCopy (load.php, line 292)
proxy (load.php, line 10)
dispatch (load.php, line 45)
eventHandle (load.php, line 38)

Version: unspecified
Severity: normal