Mobile Responsive - Slider with Animations

Please provide your valuable feedback for the below questions. These questions are based on the problems that I faced while developing the solution.

• I used setTimeout for my animation. But i came across a function named sleep in Javascript. But eventually it didn't work for me, so i switched to setTimeout. Any suggestions on how to it ?
• I am using Blisk browser for testing my mobile version. But its not free. Any other suggestion for free browsers for testing the mobile version would be really helpful.

Thanks ! Sudhar