id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
13887	Target attribute value is altered when using edit link	Sam		"== Steps to reproduce ==

1. Create a new hyperlink
2. Toggle the editor to show the source
3. Add a target attribute to the a tag with something like ""sso-link"" as the value
4. Toggle the editor to not show the source
5. Right click the hyper link and select 'Edit Link'
6. Save the link, there is no need to change anything
7. Toggle the editor to show the source again

== Expected result ==
The value of the target attribute will not have changed
== Actual result ==
The value of the target attribute has changed from ""sso-link"" to ""ssolink""
== Other details (browser, OS, CKEditor version, installed plugins) 
According to [http://www.w3.org/TR/html51/browsers.html#valid-browsing-context-name w3.org] the target attribute should be allowed any valid browser context name, which is any string that is ASCII.

The [https://github.com/ckeditor/ckeditor-dev/commit/6b44fed5f3e3c5c2d89f6d06370b5c3662d4f679 code change] that caused this was implemented to fix an IE bug on[http://dev.ckeditor.com/ticket/5278 ticket 5278] however it was a little to aggressive with removing invalid characters."	Bug	closed	Normal	CKEditor 4.5.5	UI : Dialogs	4.5.5	fixed		byran.zaugg@…