[whatwg] Footer inside header

[Andrés Sanhueza]

Currently, a <footer> tag is not allowed to appear inside a <header>
tag and vice-versa. That does makes sense when sticking to what the
names of the elements imply, yet conceptually I see no reason a
<footer> as in "textual metadata of a section" can't be inside a
<header> ("lead of a section"). Could this be considered to be
allowed?