McKinsey Blog
Why is this a good pattern?
▲ Vibrant color allow users to visualize the status bar.
▲ Status bar growing and shrinking with scroll gives a clear map of your reading position.
How could this be improved?
▼ When status bar reaches the end there should be a strong action to follow. Such us recommended related article to keep reading, a clear call-to-action to share on social networks or suscribe for more content.