A key requirement for my social reader is for it to be usable on mobile. To accomplish this goal, I have added some progressive web application features to my reader, enabling its use as an app I can save to my home screen. I have also spent a lot of time thinking about how the social reader should look on mobile.
While I was trying to figure out how to link a manifest.json file to my feed reader, I found myself looking at the source code behind Jeremy Keith's website home page. The fact that you can see the source code behind how a page loads is an amazing feature behind the web. You can see the code that tells a browser how a web page loads. Sometimes the source code behind a site is almost or completely illegible but there are plenty of sites out there whose code you can peruse.