A-Frame Course - Source of /examples/1200-animations-05-scaleaxis.html

<!DOCTYPE html>
<html>
  <head>
    <title>Animations - 05 - Scale axis</title>
    <script src="https://aframe.io/releases/1.2.0/aframe.min.js"></script>
    <script src="../js/livecode.js"></script>
  </head>
  <body>
    <a-scene background="color:lightblue">
      <a-entity
        id="growingbox"
        position="0 1 -2"
        animation="property: scale; from: 1 1 1; to: 1 2 1; dur: 1000; loop: true; easing: linear; dir: alternate"
      >
        <a-box
          position="0 0.25 0"
          width="0.1"
          height="0.5"
          depth="0.1"
          color="#ff0000"
        >
        </a-box>
      </a-entity>

    </a-scene>
  </body>
</html>