Appends raw text to the attribute.
If the attribute already has contents and the last piece of content is also text, then the text will be appended to the value of that AttributeContent. Otherwise, a new AttributeContent will be appended to contents.
See Implementation
Appends raw text to the attribute.
If the attribute already has contents and the last piece of content is also text, then the text will be appended to the value of that AttributeContent. Otherwise, a new AttributeContent will be appended to contents.