CssHow-ToBeginner · 3 min read

How to Use animation-delay in CSS for Smooth Animations

Use the animation-delay property in CSS to set a time delay before an animation starts. It accepts time values like 2s or 500ms, allowing you to control when the animation begins after the element loads or is triggered.

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Syntax

The animation-delay property defines how long to wait before starting the animation. It accepts a time value in seconds (s) or milliseconds (ms).

animation-delay: time value (e.g., 2s, 500ms)
Can be negative to start the animation partway through

css

animation-delay: 2s;
animation-delay: 500ms;
animation-delay: -1s;

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Example

This example shows a box that changes color with a 2-second delay before the animation starts.

css

html, body {
  height: 100%;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #f0f0f0;
}

.box {
  width: 150px;
  height: 150px;
  background-color: #3498db;
  animation-name: changeColor;
  animation-duration: 3s;
  animation-delay: 2s;
  animation-fill-mode: forwards;
}

@keyframes changeColor {
  from { background-color: #3498db; }
  to { background-color: #e74c3c; }
}

Output

A blue square appears centered on the page. After 2 seconds, it smoothly changes its color to red over 3 seconds.

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Common Pitfalls

Common mistakes when using animation-delay include:

Not setting animation-fill-mode, so the element snaps back after animation ends.
Using negative delays without understanding they start the animation partway through.
Forgetting to specify units like s or ms, which makes the value invalid.

css

/* Wrong: missing units */
.box {
  animation-delay: 2; /* invalid, no units */
}

/* Right: with units */
.box {
  animation-delay: 2s;
  animation-fill-mode: forwards;
}

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Quick Reference

Property	Description	Example
animation-delay	Time to wait before animation starts	animation-delay: 1.5s;
animation-fill-mode	Defines styles after animation ends	animation-fill-mode: forwards;
animation-duration	Length of the animation	animation-duration: 3s;
Negative delay	Starts animation partway through	animation-delay: -1s;

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Key Takeaways

Use animation-delay to control when an animation starts by specifying a time value with units.

Always include units like s or ms to avoid invalid CSS.

Combine animation-delay with animation-fill-mode: forwards to keep the final animation state visible.

Negative animation-delay values start the animation partway through, which can be useful for syncing animations.

Test animations in the browser to see the delay effect clearly.