feat: check the formal viewport meta tag syntax
#1400
Merged
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HTM-047is now reported for invalidviewportvaluesHTM-056is reported when aviewportvalue has nowidthorheightHTM-057is reported when a viewport width or height value is invalid (i.e. not a positive number or a well-known kewyword)Also:
isASCIIWhitespacestatic utility method is extraced to a publicInfraUtilclass in a neworg.w3c.epubcheck.util.infrapackageepub3/F-viewport-meta-tagdirectory, as if it was a functional test.epub3/08-layoutdirectory, for viewport metadata checks.Fixes #1214, fixes #1347
Note: this does not include the latest post-CR updates to the viewport requirements