Use the Chrome Dev tools for simulating mobile devices and visual representations of media queries used for the page
Ne features include the following
- Choose the device by name and resolution
- Emulate mobile network speeds of G3 and EDGE
- Emulate touch, geolocation and accelerometer
- Remote debugging on Android devices that are plugged in via USB
- Visualize DOM layers to find painting jankiness including a Paint Profiler tool
Read more from the source: GirlieMac Blog