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Spec section: https://html.spec.whatwg.org/multipage/rendering.html#replaced-elements AFAICT, the term "replaced element" is from http://www.w3.org/TR/CSS2/conform.html#replaced-element , and therefore instances of that term in the HTML spec ought to link-to/reference the CSS2 spec, just like the rest of the jargon from other specs. Folks shouldn't need to figure out this cross-reference manually.
Fixed in https://github.com/whatwg/html/commit/0dfaea38980ecff6a5aeddbb643a097b64c4eef4