Frontend Developer
hardbrowser-rendering-critical-path
Explain the browser rendering process (critical rendering path).
Answer
The critical rendering path is how the browser turns HTML/CSS/JS into pixels:
1) Parse HTML → DOM
2) Parse CSS → CSSOM
3) Combine DOM + CSSOM → Render Tree
4) Layout (calculate sizes/positions)
5) Paint and Composite
**Performance tips:** minimize render-blocking CSS/JS, reduce layout thrashing, and avoid heavy work on the main thread.
Related Topics
PerformanceBrowsersJavaScript