How can CSS animation be used to enhance user experience on the web page?

CSS Animations are the soul of modern web-page design. It is not just for visual “doing something cool”, but more importantly for the purpose of guiding users through dynamic feedback, explaining interface logic and creating a branded emotional link. A perfect animation can make cold code friendly.

1. Addressing feedback lags in interaction

When the user clicks a button or submits a form, if there is no change in the interface, the user doubts whether the system is dead. This is what is called the “missing of interactive feedback”.

Solutions: Add a slight to the button scale (Scaling) or box-shadow (shade) changes, or uses the fade-in effect when loading content. These subtle kinetic effects immediately inform users that the system has received your instructions and is in the process of processing.

2. Visual focus for guiding users

Information on the web pages is often overloaded. By animation, designers can proactively control the flow of attention to users. For example, a notification icon for Bounce, or a new functional guide page that slides from the right into Slide-in.

Note: The dynamic effect should be purposeful. Too many meaningless animations can cause visual disruption, distracting users and even causing visual fatigue. The principle of animation should be “less or more”.

3. Optimizing best practices in animation performance

Unjustified animations can cause page cartons, which seriously affect the experience. To achieve a smooth 60FPS. Animation, which requires the following principles:

Prefer Transform and Opacity: These two properties are accelerated by GPU and do not cause page re-alignment (refring) or repaint, which is extremely expensive.
Avoid animation of Layout properties: Try not to be right. width , height , top , left equals apply animation because they trigger the browser to calculate the layout more frequently.
Use will-change hint: For complex animated elements, use will-change: transform; Inform the browser in advance of the optimization.

4. How do you select the appropriate slow motion function (Easing)?

The movement of objects in the real world is rarely even. Select the right slow function to make animation look more natural:

Ease-Out： The most commonly used slow motion, suitable for the elements of the interface, gives users a soft sense of docking.
Ease-In： The elements that are suitable for exiting the interface give the user a sense of a faster departure.
Cubic-Bezier： Customizes the Bézier curve, which creates flexible (Bouncy) effects, and increases the taste of interfaces.