Chrome DevTools for Mobile
by Chris Coyier
Emulate mobile devices directly through DevTools, simulating touch events, mimicking screen size, and spoofing user agent.
Plug in a mobile device over USB and use Chrome DevTools on the actual mobile browser. Push your local site to the mobile device with port forwarding.
This is excellent stuff, not only because it's very powerful, but because it's easy.
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*May or may not contain any actual "CSS" or "Tricks".