This browser can't run the simulator yet

It needs WebGL 2, the browser feature that draws 3D graphics. It is built into every modern desktop browser but can be switched off or blocked by old graphics drivers.

Chrome your browser

Open chrome://settings/system in the address bar.
Turn on Use graphics acceleration when available, then relaunch.
Still blocked? Open chrome://flags/#ignore-gpu-blocklist, set it to Enabled, relaunch.
Same steps apply to Edge, Brave and Opera.

Firefox your browser

Open about:config and accept the warning.
Search webgl.disabled and make sure it is false.
If it still fails, set webgl.force-enabled to true and restart Firefox.
In Settings, General, Performance, keep Use hardware acceleration ticked.

Safari your browser

Safari 15 or newer has WebGL 2 on by default. Update macOS if yours is older.
Open Safari, Settings, Advanced and tick Show features for web developers.
In the Develop menu, open Feature Flags (or Experimental Features) and make sure WebGL entries are on.
Quit and reopen Safari.

Also update your graphics drivers, close other 3D tabs, and prefer a laptop or desktop: phones and tablets are not supported. Try again