Reflow happens when a recalculates the position and geometry of certain parts of a webpage, such as after an update on an interactive site. This tends to be followed by repainting, which is when the browser redraws the webpage to show the resulting visual updates.

See also

Related glossary terms:

• Minimizing browser reflow on developers.google.com

• Understanding Reflow and Repaint in the browser on dev.to (2020)