Skeleton.html

<a-scene>
 <a-assets>
 <audio id="click-sound" src="audio/click.ogg"></audio>

 <!-- Images. -->
 <img id="city" src="https://cdn.aframe.io/360-image-gallery-boilerplate/img/city.jpg">
 <img id="city-thumb" src="https://cdn.aframe.io/360-image-gallery-boilerplate/img/thumb-city.jpg">
 <img id="cubes" src="https://cdn.aframe.io/360-image-gallery-boilerplate/img/cubes.jpg">
 <img id="cubes-thumb" src="https://cdn.aframe.io/360-image-gallery-boilerplate/img/thumb-cubes.jpg">
 <img id="sechelt" src="https://cdn.aframe.io/360-image-gallery-boilerplate/img/sechelt.jpg">
 <img id="sechelt-thumb" src="https://cdn.aframe.io/360-image-gallery-boilerplate/img/thumb-sechelt.jpg">
 </a-assets>

 <!-- 360-degree image. -->
 <a-sky id="image-360" radius="10" src="#city"></a-sky>

 <!-- Link we will build. -->
 <a-entity class="link"></a-entity>

 <!-- Camera + Cursor. -->
 <a-camera>
 <a-cursor id="cursor">
 <a-animation begin="click" easing="ease-in" attribute="scale"
 fill="backwards" from="0.1 0.1 0.1" to="1 1 1" dur="150"></a-animation>
 <a-animation begin="cursor-fusing" easing="ease-in" attribute="scale"
 from="1 1 1" to="0.1 0.1 0.1" dur="1500"></a-animation>
 </a-cursor>
 </a-camera>
</a-scene>