No,
Actually you did not run Flightcrew in Sigil-0.9.0, Your ran sanitycheck. If you want to run FlightCrew you must load its plugin and launch it. Sanitycheck just checks if the source is parseable, it is **not** an epub2 validator. If you want to validate in Sigil-0.9.0 you must load either the epubcheck plugin or the flightcrew plugin.
As for the u tag, it exists in html4 but is deprecated, it exists in xhtml 1.0, it does not exist in xhtml 1.1, but now it is back in html5, xhtml5 but with a more restricted meaning and use.
Flightcrew uses the official xhtml 1.1.dtd when validating the epub and it does not allow the u tag.
Hope this explains things.
KevinH
Last edited by KevinH; 11-22-2015 at 01:24 PM.
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