How web works
React Strict DOM is very simple on the web; it compiles optimized components and styles.
Development runtime
During development there is a very lightweight runtime component wrapper that validates styles and adds debugging information.
Optimizing compiler
Production builds rely on an optimizing compiler (using Babel) that avoids component wrappers, and limits the runtime to an optimized style merging function. Components authored with React Strict DOM are flattened to the default React DOM components.
Style compiler
Styles are optimized and extracted from JavaScript (using Babel). This is currently somewhat complicated and requires bundler integration to generate a CSS file.