Chrome DevTools

ctrl+shift+c   //—Open element inspect with hover showing the css and tags
ctrl+shift+j   //—Directly go to web console window


Test for slow and fast networks:

ctrl+shift+c  and then ctrl+shift+p

then in search box type network and you can select fast or slow 3g to test your application on slow and fast networks

in network throttling you can add a custom throttling also in the dropdown click add


Change geo location:

ctrl+shift+c and then ctrl+shift+p

then in search box type: sensor and select show sensor