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bug 30485) Fixed interference between wikihiero extension and 'wikitable' class style
Border & padding settings from the .wikitable class were overriding the rules for .mw-hiero-table and .mw-hiero-table td. Added !important on them to make sure that those inner styles consistently override whatever generic table cell rules might be in play that have the same or greater specificity.
Long-term of course it might be nice to rewrite the whole thing to compose SVG and output that. :)