The online simulators deployed at https://sim.lvgl.io/ are not working correctly.
The javascript console gives this error:
app.fb1dbf7e7fce9b719af6.js:2 Uncaught TypeError: $(...).tooltip is not a function
at app.fb1dbf7e7fce9b719af6.js:2:3086149
at dispatch (jquery-1.12.4.js:5226:27)
at elemData.handle (jquery-1.12.4.js:4878:28)
seems some jquery tooltip code is missing.