Should also update focus

[danielnixon]

Should also do something like document.documentElement.focus() or document.body.focus() at the same time as scrolling to the top of the page.

See e.g. https://simplyaccessible.com/article/spangular-accessibility/#acc-heading-3

[edoardo-bluframe]

Hey @danielnixon Cheers for the accessibility heads up!

Wanna make a PR?? 😄