Gain insights into creating beautiful, performant animations in Angular. Delve into CSS transitions, Web Animations API, and Angular animations, while exploring performance and debugging techniques.

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Animations play a crucial role in an application’s user experience (UX). A set of well-designed animations can make an application feel fast, polished, and professional. However, creating animations can be a daunting task that involves knowing what is available and how to choose the right approach for each task.

You will start with the easiest methods and move on to more advanced animation methods as you make your way through this course. You’ll start with general animation techniques, covering CSS transitions, animations, and the Web Animations API, followed by Angular animations and integrating external animation libraries. Lastly, you’ll finish with a deep dive into animation performance and debugging.

This course will provide you with information and advice to help you create beautiful and performant animations in Angular applications. By the end of the course, you will be able to create performant animations and choose the right tools to create them effectively.

Animations in Angular

**(Select all that apply.)** Which of these are CSS transition options that can be customized?


<p><strong>(Select all that apply.)</strong> Which of these are CSS transition options that can be customized?</p>


```scss
.element {
    opacity: 1;
    &:hover {
        opacity: 0.5;
    }
}
```

```scss
.element {
    opacity: 1;
    transition: opacity 1s;
    &:hover {
        opacity: 0.5;
    }
}
```

```scss
.element {
    opacity: 1;
    &:hover {
        transition: opacity 1s;
        opacity: 0.5;
    }
}
```

```scss
.element {
    opacity: 0.5;
    transition: opacity;
    &:hover {
        opacity: 1;
    }
}
```

How would you animate an element's opacity from `1` to `0.5` with a duration of `1` second when the user hovers over it?

<p>How would you animate an element’s opacity from <code>1</code> to <code>0.5</code> with a duration of <code>1</code> second when the user hovers over it?</p>


**(Select all that apply.)** Which of these events are emitted over the lifetime of a CSS transition?


<p><strong>(Select all that apply.)</strong> Which of these events are emitted over the lifetime of a CSS transition?</p>


The button changes color from `red` to `blue`


The button changes color from `red` to `blue` with a duration of `1` second

The button changes color from `red` to `blue` with a duration of `0.5` seconds and a delay of `1` second

The button changes color from `red` to `blue` with a duration of `1` second and a delay of `0.5` seconds

What would be the expected behavior of the code below as the `isBlue` flag changes from `false` to `true`?

```html
<button
    class="my-button"
    [class.blue]="isBlue">
    Button
  </button>
```

```scss
.my-button {
    background-color: red;
    transition: background-color 1s 0.5s;
    &.blue {
        background-color: blue;
    }
}
```

<p>What would be the expected behavior of the code below as the <code>isBlue</code> flag changes from <code>false</code> to <code>true</code>?</p>
<pre><code class="language-html">&lt;button
    class=&quot;my-button&quot;
    [class.blue]=&quot;isBlue&quot;&gt;
    Button
  &lt;/button&gt;
</code></pre>
<pre><code class="language-scss">.my-button {
    background-color: red;
    transition: background-color 1s 0.5s;
    &amp;.blue {
        background-color: blue;
    }
}
</code></pre>


The button changes background color from`red` to `blue` and shrinks to 70% of its original size without any animation.

The button changes background color from `red` to `blue` and shrinks to 70% of its original size. Both animated.

The button changes background color from `red` to `blue` and shrinks to 70% of its original size. Only the size change is animated.

The button changes background color from `red` to `blue` and shrinks to 70% of its original size. Only the background color change is animated.

What is the expected animation output of the code below as the user hovers over the button?

```html
<button>Button</button>
```

```scss
button {
    background-color: red;
    transform: scale(1);

    transition: transform 0.5s;
    &:hover {
        background-color: blue;
        transform: scale(0.7);
    }
}
```

<p>What is the expected animation output of the code below as the user hovers over the button?</p>
<pre><code class="language-html">&lt;button&gt;Button&lt;/button&gt;
</code></pre>
<pre><code class="language-scss">button {
    background-color: red;
    transform: scale(1);

    transition: transform 0.5s;
    &amp;:hover {
        background-color: blue;
        transform: scale(0.7);
    }
}
</code></pre>


Before We Start

CSS Transitions

CSS Animations

Web Animations API (WAAPI)

Angular Animations

Third-party Animation Libraries

Appendix

Conclusion

Quiz Yourself: CSS Transitions