У вашего броузера проблема в совместимости с HTML5
Redmi Y3 pattern unlock settings: Open settings in Redmi Y3 and select lock screen and password option. Now click on set screen lock. Here select lock screen. Read the instructions for few seconds and click got it. Now draw the pattern that you want to set. Again draw the pattern to verify. Click confirm. That's all. Enjoy setting up pattern unlock in Redmi Y3 smartphone.