What happens after redrawing and reflowing

After redraw and reflow operations, the browser will recalculate and render the page view. This process may affect the layout and rendering of other elements. Therefore, if reflow and redraw occur frequently, it will cause performance problems, leading to page freezes and slow response.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

After redraw and reflow operations, the browser will recalculate and render the page view. This process may affect the layout and rendering of other elements. Therefore, if reflow/redraw occurs frequently, it will cause performance problems, leading to page freezes and slow response.

When a redraw operation is required, the browser will redraw the content of the element based on the changed style attributes and the element's position and size on the screen. This process does not require recalculation of the element. layout, so the performance consumption is relatively small.

When the size, position and other attributes of an element change, the browser needs to recalculate the layout of the element and redraw the page. This process is called reflow. This process is expensive and will cause the entire rendering tree to be rebuilt and the page to be rearranged. Therefore, frequent triggering of reflow operations should be avoided to improve page performance.

In general, redrawing mainly affects the appearance of elements, while reflowing affects the layout and appearance of elements and is more expensive. Both will affect the performance of the page. Therefore, when writing code, you should design a reasonable DOM structure and try to avoid frequent reflow and redraw operations to optimize page performance.

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