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Table of Contents
What does will-change actually do?
When should you use will-change ?
What problems can happen if you misuse it?
Final thoughts
Home Web Front-end CSS Tutorial What is the purpose of the CSS `will-change` property?

What is the purpose of the CSS `will-change` property?

Jul 23, 2025 am 03:47 AM
css

will-change is a CSS property that is used to inform browser elements in advance of possible changes to optimize performance. Its core function is to enable the browser to create layers in advance to improve rendering efficiency. Common values include transform, opacity, etc., and can also be separated by multiple attribute commas; it is suitable for non-standard attribute animations, complex component transitions and user interaction triggered animations; but it must be avoided abuse, otherwise it will lead to excessive memory usage or increased GPU load; the best practice is to apply before the change occurs and remove it after it is completed.

What is the purpose of the CSS `will-change` property?

The will-change property in CSS is used to inform the browser ahead of time about what kinds of changes you expect on an element, so it can optimize how it handles those changes. This can improve performance, especially during animations or transitions.

What is the purpose of the CSS `will-change` property?

It's not about making things faster by itself — it's more about giving the browser a heads-up so it can prepare.

What does will-change actually do?

Browsers are smart and usually handle optimizations automatically. But sometimes, they wait until the last second to make performance decisions, which can cause small hiccups — like a slight lag when something starts animating.

What is the purpose of the CSS `will-change` property?

By using will-change , you're saying:

“Hey browser, I'm going to change this thing soon — maybe even repeatedly — so get ready.”

What is the purpose of the CSS `will-change` property?

This tells the browser to create a new layer for that element early (like using transform or opacity would), so when the change happens, it's smoother.

Common values include:

  • will-change: transform;
  • will-change: opacity;
  • will-change: scroll-position;
  • will-change: contents;

You can also list multiple properties separated by commas:

 will-change: transform, opacity;

When should you use will-change ?

Using will-change isn't always necessary. Browsers already optimize common animation properties like transform and opacity .

But there are cases where it helps:

  • Animating properties that aren't normally optimized (eg, width , left , top )
  • Complex UI components that need smooth transitions (like modals, sliders, or tabs)
  • Elements that will be animated after user interaction (hover, click)

?? Important note: Don't overuse it. Telling the browser everything is going to change can backfire because creating too many layers uses extra memory and might actually slow things down.

A good pattern is to apply will-change right before the change happens and remove it afterward. For example:

 .element:hover {
  will-change: transform;
}

Or better yet, use JavaScript to add/remove a class with will-change just before animation starts.

What problems can happen if you misuse it?

Misusing will-change can lead to worse performance instead of better. Here's why:

  • Too many layers : Each layer takes up memory. If dozens of elements are promoted to their own layers unnecessarily, it can cause jank or high GPU usage.
  • Premature optimization : Applying will-change to every animated element is like warming up the oxygen before you decide what you're cooking — it doesn't help and may waste resources.
  • Unexpected behavior : Some properties like contents or scroll-position can cause layout shifts or repaint issues if not handled carefully.

So keep it simple:

  • Use it only when needed
  • Target specific properties
  • Apply it close to when the change happens
  • Remove it when no longer needed

Final thoughts

Using will-change can help make animations smoother by letting the browser prepare. It's most useful when dealing with non-standard properties or complex interactions.

But remember — it's a hint, not a command. The browser still decides how to act based on that hint.

And in most cases, sticking with hardware-accelerated properties like transform and opacity is enough. You probably won't need will-change unless you've run into performance issues and are trying to fine-tune them.

Basically that's it.

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