Kit stories in Unity WebGL. Nothing downloads until you click Load playground.
Unity WebGL demo (sus-demo, ~18 MB). Nothing downloads until you click Load.
WebGL required. Fullscreen hides the page around the player; Esc brings it back.
On a phone the player already takes the full screen width, so the UI renders its mobile layout; Fullscreen only hides the page around it.
Drag the slider to narrow the frame and watch the layout switch breakpoints.