2.2.9 [W3C-EPUB3] Section 4.4.2.3.1. Usage
C0012: The rendition:orientation property is not supported and is ignored
The specification states:
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› 4.4.2.3.1 Usage When the rendition:orientation property is specified on a meta element, it indicates that the intended orientation applies globally for the given Rendition (i.e., for all spine items).
EdgeHTML Mode
The rendition:orientation
property is not supported and is ignored.