Earlier quoted context omitted.
What's that behavior? Do you have an example of a website where selectable text makes keyboard navigation not possible? Could this be a browser problem? I can tab between links here in HN and it's perfectly also selectable.
Use a mouse to click inside of a word link (like "threads") in the HN header. Try to drag to highlight. Note that the link tries to drag instead of highlighting. This is default behavior for anchors because of the issues that it would otherwise cause with the whole selection API. Alternatively, set your cursor at the end of the header in the empty space, and drag your mouse backward to highlight the items. At that po…
You are saying "tab headers, buttons, or even text-sparse tiles [...] should, prevent text selection".
The website is advocating for not disabling selection, not for enabling in random places.