CSS performance optimization - detailed explanation of will-change usage

will-change tells the browser what changes will happen to the element, allowing the browser to make optimization preparations in advance and enhance page rendering performance.

Attribute value:

1. auto: implement standard browser optimization.

2. scroll-position: Indicates that the developer hopes to change the position of the scroll bar or animate it in the near future.

3. contents: Indicates that the developer wants to change something in the element's contents or animate them in the near future.

4. <custom-ident>: Indicates that the developer hopes to change the specified attribute name or animate it in the near future, such as transform or opacity.

Instructions for use:

1. Don’t apply will-change to too many elements. If overused, it may cause the page to respond slowly or consume a lot of resources.

2. Usually, when an element is restored to its original state, the browser will discard the optimization work done previously. But if you explicitly declare the will-change property directly in the style sheet, indicating that the target element may change frequently, the browser will save the optimization work longer than before. So the best practice is to clear it out immediately after use.

3. If your page has no performance issues, don't add the will-change attribute to squeeze out a little bit of speed. will-change is designed to be an optimization of last resort, to try to fix existing performance problems, and it should not be used to prevent performance problems.

compatibility:

Summarize

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