防止移动设备在网站上睡眠

I have got a website that runs on php, javascript,and html. Im hopping there is a way to stop the mobile device (tablets, android and ios) from going to sleep.

I have done some research on this but they are not very helpful. I have tried NoSleep.js and the answer from This answer from SO but they all seems not working, my android (ver 6.0) would still go to sleep and my iphone 6s goes to sleep too.

Any solutions?

Edit: For performance I prefer not to have an invisible video or audio playing in the background