The `transition-delay` property determines the time interval before a transition animation starts. It can be utilized in creating transition sequences for various elements. 
```css
transition-delay: 0.5s | 500ms;
```
By default, the delay time is set to `0` seconds. 

Let's consider the following example. When we hover over the square, the transition animation will begin in `1` second, as the `transition-delay` is set to `1000` milliseconds.

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What does the `transition-delay` property control?

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Advanced CSS Techniques

Adding Delay to CSS Transitions