ルattr-duplicationattr-value-quotescase-sensitive-attr-namecase-sensitive-tag-namecharacter-referenceclass-namingdeprecated-attrdeprecated-elementdisallowed-elementdoctypeend-tagheading-levelsid-duplicationRulesineffective-attrinvalid-attrlabel-has-controllandmark-rolesneighbor-popoversno-ambiguous-navigable-target-namesno-boolean-attr-valueno-consecutive-brno-default-valueno-duplicate-dtno-empty-palpable-contentno-hard-code-idno-orphaned-end-tagno-refer-to-non-existent-idno-use-event-handler-attrpermitted-contentsplaceholder-label-optionrequire-accessible-namerequire-datetimerequired-attrrequired-elementrequired-h1table-row-column-alignmentuse-listwai-ariaルールineffective-attrこのページの見出しineffective-attr指定された属性が要素に影響を与えることができない(つまり無意味である)場合は警告します。Markuplint.。