this example will vibrate your device if the command is supported in your device's browser.
check support on this page: https://caniuse.com/?search=Navigator%20API%3A%20vibrate

for the command to work, you must also focus the window - by having the user interact with the canvas - for example: touch pressing the page.

Do Not Disturb mode can also affect the functionality of this operator on your device, preventing the vibration command when DNB is on.