FSCSS animation example

This example demonstrates a concise animation technique using FSCSS. Let's compare standard CSS animation with the FSCSS approach.

Standard CSS Animation:

The HTML is simple:

<h1></h1>
<div></div>

The CSS uses @keyframes to define the animation:

h1, div {
  animation: change 3s linear infinite;
}

@keyframes change {
  0% {
    background: red;
    width: 0;
    height: 0;
  }
  100% {
    background: #00f;
    width: 150px;
    height: 150px;
  }
}

This creates an animation where both the <h1> and <div> elements transition from a red, zero-sized square to a blue, 150px square.

FSCSS Animation:

FSCSS offers a more compact syntax. Here's the FSCSS equivalent:

$(@keyframes h1, div &[3s linear infinite]) {
  0% {
    background: red;
    %2(width, height[: 0;])
  }
  100% {
    background: #00f;
    %2(width, height[: 150px;])
  }
}

The $(...) syntax encapsulates the @keyframes declaration, applying it to both <h1> and <div>. The %2(width, height[: ...]) is a shorthand for setting both width and height properties simultaneously.

CodePen Example:

The provided CodePen link (https://www.php.cn/link/dd32c0fc8172acd5312c1089a5aa4d33) visually demonstrates the animation's effect. This allows you to see the animation in action and compare the brevity of the FSCSS code. The animation shows a smooth transition between the red and blue squares.

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