[ta834939874]

similar effects:

https://codyhouse.co/demo/reading-progress-indicator/index.h...

http://tympanus.net/Development/StorytellingMap/

[paradite]

After scrolling through the first one, I had to swipe left (gesture to go back on Mac) so many times to get back here.

[pkkim]

That first one did a number on my back history, unfortunately.