Summary: Make HTML <link> elements not query the browser history. This
is unnecessary work, and matches other browsers (kinda, see below in the
"Other browsers" section).
The TLDR is that even though this is technically required per spec as of
today, it's a fairly obscure feature where there's no interop, and it
causes issues unnecessarily, and extra history queries for no good reason.
Long term we should probably aim for <link> to not be traversable (even
if you force-show it).
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1572246
Standard: https://drafts.csswg.org/selectors-4/#location (though note
https://github.com/w3c/csswg-drafts/issues/3817).
Platform coverage: All
Preference: none
Devtools bug: N/A
Other browsers:
Behavior here is all over the place. We used to match the current spec
text and WebKit, until
http://trac.webkit.org/projects/webkit/changeset/244642 landed not long ago.
With this change, we'd match Edge and WebKit. Chrome is the only browser
which doesn't consider <link> a :link to begin with, and you can't click
on force-showed links.
We may want to aim for this behavior in the long run to simplify the
code, since force-showing a <link> element doesn't seem useful over-all.
That may or may not require changes in the HTML spec
(https://html.spec.whatwg.org/#links).
-- Emilio
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