A web page includes the following CSS code:
```css
@keyframes anim_01 {
0% { left: 0px; top: 0px; }
50% { left: 200px; top: 0px; }
100% { left: 600px; top: 0px; }
}
.animation {
position: relative;
animation-name: anim_01;
animation-duration: 4s;
animation-timing-function: linear;
animation-iteration-count: infinite;
animation-direction: alternate;
animation-play-state: running;
}
```
What happens to the animation when the style is invoked?
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Correct Answer:
A
> ''The animation changes the `left` property from 0px to 600px while keeping the `top` at 0px throughout. This means the animation causes horizontal movement only.''
>
> ''Since `position: relative` is set, changes in `left` and `top` move the element relative to its normal position.''
Thus, the element moves horizontally across the screen, alternating direction infinitely.
* MDN Web Docs: CSS animation-direction, animation-name
* CSS Animations Module Level 1 Specification
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