Ckeditor Allowedcontent Behaving Oddly

Im trying to limit the html editing behavior of CKEditor when switching between source and wysiwyg mode. Currently when I switch from source to wysiwyg the editor removes any attr

Solution 1:

That's because style and class attributes are not handled by Advanced Content Filter as other attributes - they have their specific format in Allowed Content Rules. You can find a detailed description of ACRs in Allowed Content Rules guide. But in short - to allow all attributes, styles and classes you need to set:

allowedContent:'span[*]{*}(*)'

PS. If you set allowedContent = true correctly, then your spans wouldn't be filtered at all.