Glossary term
What is reflow (Reflow (layout))?
reflow stands for Reflow (layout).
The browser works out the size and place of elements again. It is costly. Changing width, height or margin causes it.
Learn it properly · The Browser ContractLesson 8: Browser Rendering and the Event Loop in PracticeParse, style, layout, paint and composite. Also layout thrashing, and where tasks, microtasks and requestAnimationFrame fit.