[html] propagate rel attribute from reference nodes
#12489
Merged
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See https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel,
this allows third-party extensions to set this attribute on the node and have it propagate to the output HTML,
for example executablebooks/MyST-Parser#857
related to #12477
(see also https://www.freecodecamp.org/news/what-is-tabnabbing/, for why it should be used when opening links in new tabs)