2.2.8 [W3C-EPUB3] Section 4.4.1.3. The rendition:align-x-center Property

C0011: The rendition:align-x-center property is not supported and is ignored

The specification states:

 › 4.4.1.3 The rendition:align-x-center Property
  
 When the rendition:align-x-center property is set on a spine item, it indicates that the 
 rendered content should be centered horizontally within the viewport or spread, as 
 applicable. This property does not affect the rendering of the spine item, only the 
 placement of the resulting content box.

EdgeHTML Mode

The rendition:align-x-center property is not supported and is ignored.