How to reduce html reflow and redraw

The method to reduce html reflow and redrawing is to use CSS3 animation, avoid frequent DOM operations, use transform and opacity to achieve animation effects, avoid using table layout, use requestAnimationFrame to optimize animation effects, and use CSS Sprites to Reduce HTTP requests, use caching to reduce reflows and redraws, etc. Detailed introduction: 1. Use CSS3 animation instead of JavaScript animation, JavaScript animation, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

HTML reflow and redrawing are a very important part of web page performance optimization. Reflow and redrawing consume a large amount of computing resources and reduce the performance of web pages, resulting in slower page loading and reduced user experience. Therefore, reducing HTML reflows and redraws is crucial to improving web page performance. This article will introduce some methods to reduce HTML reflow and redraw.

1. Use CSS3 animations instead of JavaScript animations: JavaScript animations usually cause reflow and redrawing, while CSS3 animations can take advantage of GPU acceleration to reduce the number of reflows and redraws. Therefore, try to use CSS3 animation to achieve animation effects on web pages.

2. Avoid frequent DOM operations: DOM operations are very expensive, and each operation on the DOM will cause reflow and redrawing. Therefore, to minimize the number of operations on the DOM, you can group the DOM operations together or use DocumentFragment to insert DOM elements in batches.

3. Use transform and opacity to achieve animation effects: The transform and opacity properties can use GPU acceleration to reduce the number of reflows and redraws. Therefore, when implementing animation effects, try to use transform and opacity to change the position and transparency of elements.

4. Avoid using table layout: table layout will cause an increase in the number of reflows and redraws, because table layout needs to calculate the size and position of each cell. Therefore, try to avoid using table layout and use flexbox or grid layout instead.

5. Use requestAnimationFrame to optimize animation effects: requestAnimationFrame is an API provided by the browser to optimize animation effects. It can execute animations according to the refresh rate of the browser and reduce the number of reflows and redraws. Therefore, when implementing animation effects, try to use requestAnimationFrame to optimize animation effects.

6. Use CSS Sprites to reduce HTTP requests: CSS Sprites merge multiple small icons into one large icon, and display different icons by setting background-position. This can reduce the number of HTTP requests, reduce the number of reflows and redraws.

7. Use cache to reduce reflow and redraw: You can use cache to store calculation results to avoid repeated calculations. This can reduce the number of reflows and redraws and improve the performance of web pages.

To summarize, reducing HTML reflow and redrawing is very important to improve web page performance. By using CSS3 animation, avoiding frequent DOM operations, using transform and opacity to achieve animation effects, avoiding using table layout, using requestAnimationFrame to optimize animation effects, using CSS Sprites to reduce HTTP requests, and using caching to reduce reflow and redrawing, it can be effective It greatly reduces the number of HTML reflows and redraws, improves the performance of web pages and enhances user experience.

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