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In Relative Selectors: http://dev.w3.org/csswg/selectors4/#relative we have: "Relative selectors, once absolutized, can additionally be scope-contained (such as within the ::distributed() pseudo-class [[SHADOWDOM]]) or scope-filtered." ::distributed() is pseudo-element, not pseudo-class. In Selector table: http://dev.w3.org/csswg/selectors4/#overview we have double description for this pseudo: E:required E:optional Second row should have description for :user-error pseudo-class. In :focus pseudo-class: http://dev.w3.org/csswg/selectors4/#the-focus-pseudo we have: "There may be document language or implementation specific limits on which elements can acquire :focus. For example, [HTML5] defines a list of activatable elements." You put HTML5 link not for :focus but for :active. No big problem, but you can easy fix it:)