|
IIRC epub:type="pagebreak" is an epub3 specific extension. Currently, almost nothing supports it.
The colon refers to a XML namespace. If you want to use it, you have to declare the epub namespace and make sure the document you are modifying is valid XML. The IDPF just likes to make everyone's life harder by using XHTML instead of plain HTML 5.
Other than that, it's fine, although note that inserting an empty span tag into a document can have side effects, since the document can use CSS selectors based on tag counts.
As I said before, the only sure way of modifying the document with no side effects is to use data- attributes. But that hhas the limitation of restricting page markers to existing tag locations.
|