If I understood right, vertical-align shouldn't take value of inherit if one is to believe MDN, but then again browsers seem to implement it with td elements for example:
That is why I think inherit should be added to https://github.com/CSSLint/parser-lib/blob/master/src/css/Properties.js#L526:
"vertical-align" : "auto | use-script | baseline | sub | super | top | text-top | central | middle | bottom | text-bottom | <percentage> | <length>",