A component holds a bucket of data in the form of one or more component properties. Components use this data to modify entities. Consider an engine component, we might define properties such as horsepower or cylinders.
HTML attributes represent component names and the value of those attributes represent component data.
If a component is a single-property component, meaning its data consists of a single value, then in HTML, the component value looks like a normal HTML attribute:
<!-- `position` is the name of the position component. --> <!-- `1 2 3` is the data of the position component. --> <a-entity position="1 2 3"></a-entity>
If a component is a multi-property component, meaning the data is consists of multiple properties and values, then in HTML, the component value resembles inline CSS styles:
<!-- `light` is the name of the light component. --> <!-- The `type` property of the light is set to `point`. --> <!-- The `color` property of the light is set to `crimson`. --> <a-entity light="type: point; color: crimson"></a-entity>