title: Visual response for loading pages in pwa
body: <p>Is there a way to let PWA users know that a clicked link is being loaded. Usually in the browser we see the blue progress line indicating this but in the pwa the user is left to assume the page is loading except there is a pseudo effect on the buttons programmed by the developer. I understand the idea behind pwa includes giving users immersive visuals and if pages load faster, the users will not bother about the blue line but sometimes it's needed. </p>