I want to implement WebGL model viewer using Unity. This viewer is integrated into existing website. On this website there is a list of models and when user clicks on a model a window pops out displaying this model (like sketchfab). I integrate model viewer which was built with Unity WebGL using
<iframe src="./path-to-unity-webgl-viewer"></iframe>
How can I communicate with the viewer. Is there a way to create some javascript API using Unity which can be accessed from outside Unity app?