Jeremy Keith explains how he built the timeline of inspirations and achievements of the World Wide Web:
I don't really agree with the simple statement made in the title of this article, as sizing fonts with rem is sometimes useful to escape the default cascading sizing, but the most important part here IMHO is the following:
As a web developer, learning the internals of browser operations helps you make better decisions and know the justifications behind development best practices. While this is a rather lengthy document, we recommend you spend some time digging in; we guarantee you’ll be glad you did.
Inter-app communication is one of the major missing pieces of the web platform, and specifically one of the last major missing features is native level sharing: Web apps need to be able to get data out of their silo and into other web sites and apps; they also need to be able to receive the data from other native apps and sites.