2.1.4 [W3C-EPUB3] Section 3.4.5. The DCMES language Element

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V0008: Leading and trailing whitespace is not trimmed

The specification states:

 › 3.4.5 The DCMES language Element
  
 The [DCMES] language element specifies the language of the content of the given Rendition.
 ...
 Reading Systems must trim all leading and trailing whitespace from the element value, as 
 defined by the XML specification [XML], before processing the value.

EdgeHTML Mode

Leading and trailing whitespace is not trimmed.