> where p::first-line:hover means p:hover::first-line? It doesn't. They never very equivalent. The CSS Selectors Level 3 spec effectively allowed the pseudo element to be [only at the end](https://www.w3.org/TR/css3-selectors/#pseudo-elements) of the selector: > Only one pseudo-element may appear per selector, and if present it must appear after the sequence of simple selectors that represents the [subjects](https://www.w3.org/TR/css3-selectors/#subject) of the selector. > The _elements of a document tree_ that are represented by a selector are the subjects of the selector. so if the _element_ represented by a selector — the subject of the selector — is a hovered paragraph, then the pseudo element can only follow the `p:hover` part, but never be inserted between `p` and `hover`. In fact, `p::first-line:hover` was simply invalid (though it was not very clear per grammar) and was treated as such in all browsers (AFAIK). -- GitHub Notification of comment by SelenIT Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/2153#issuecomment-355558319 using your GitHub accountReceived on Friday, 5 January 2018 13:47:22 UTC
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