CSS is device neutral and works on things that don't have shift keys or context menus, so we can't specify the mechanism. However, we can make it allowed, or ev

CSS is device neutral and works on things that don't have shift keys or context menus, so we can't specify the mechanism. However, we can make it allowed, or even recommended for browsers to provide a way to select anyway, even if the spec leaves it up to the browser what UI it wants to use for that.