This is a port of the MDN React Todo App, rebuilt using Dataflow.
The entire app is a single HTML file 66 lines of code (~12KB / 4KB gzipped) plus a small stylesheet (~5KB / 1KB gzipped). Compare this to the React version which weighs in at 300 lines of code / ~150KB bundle / 50KB gzipped.
That is 80% less code and 90% less runtime