Follows this link on mousedown instead of click.
This will save precious milliseconds that otherwise spent
on waiting for the user to release the mouse button. Since an
AJAX request will be triggered right way, the interaction will
appear faster.
Links with the [up-instant] attribute are always followed by Unpoly and will not make a full page load.
To follow all links on mousedown, configure up.link.config.instantSelectors.
Example
<a href="/users" up-follow up-instant>User list</a>
Accessibility
Links with [up-instant] can still be activated with the keyboard.
With [up-instant] users can no longer cancel a click by dragging the pressed mouse away from the link.
However, for navigation actions this isn't needed. E.g. many operation systems switch tabs on mousedown
instead of click.
