Toggle cover/contain

apps/streams.js

             fontSize: 'xxx-large',
         }
         const styleVideo = {
-            objectFit: 'contain', // cover
+            objectFit: 'contain',
             width: '100%',
             height: '100%',
             transform: 'scaleX(-1)',
             ),
             m('video[playsinline][autoplay]', {
                 style: styleVideo,
+                onclick: ({target: {style}}) => {
+                    const level = style.objectFit === 'contain'
+                    style.objectFit = ['contain', 'cover'][+level]
+                },
                 oncreate: this.setUp(username),
                 onremove: this.tearDown(username),
             }),