How Can I Animate CSS Custom Properties to Sequentially Show/Hide Multiple Elements?

Animating CSS Custom Properties/Variables

Problem:

Animating multiple elements with CSS custom properties (variables) isn't working as expected. The desired outcome is for inner divs to appear and disappear in sequence using a variable to control opacity.

Solution:

CSS Properties with Custom Types:

Introduce a custom type for the variable using @property, which allows the browser to understand the variable's data type and enable gradual animation:

@property --opacity {
  syntax: '<number>';
  initial-value: 0;
  inherits: false;
}

Animation with Custom Property:

Use the custom property in the animation keyframes:

@keyframes fadeIn {
  50% {--opacity: 1}
}

html {
  animation: 2s fadeIn infinite;
  background: rgba(0 0 0 / var(--opacity));
}

In this example, the html element's background is animated from completely transparent to partially opaque based on the --opacity variable, which is gradually interpolated over time.

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