What is the difference between reflows and repaints in web development?

What is the difference between reflows and repaints in web development?

Reflows and repaints are both processes that occur in the browser when changes are made to the DOM. A reflow happens when the layout of the page needs to be recalculated, while a repaint occurs when only the visual appearance of an element changes without affecting the layout.

Can you give me an example of when a reflow occurs?

Sure! A reflow occurs when you change the size of an element, like adjusting the width of a div. This requires the browser to recalculate the layout of the page.

And what about repaints? When do they happen?

Repaints happen when you change the color or visibility of an element, such as changing the background color. The layout remains the same, but the visual representation is updated.

How can I minimize reflows and repaints for better performance?

To minimize reflows and repaints, batch DOM changes together, avoid using layout-triggering properties, and use CSS transitions instead of JavaScript for animations.