When navigating to an anchor in a page, highlight it.

[christianp]

At the moment I'm writing a package with a separate bibliography page. When I click on a link to a bibliography entry, it's hard to immediately pick out which line I'm supposed to be looking at.

When navigating to a fragment, that element should have some styling applied. I suggest the background-color: var(--background-accent-3); text-decoration: dotted underline.