The Google Chrome browser has a built in set of developer tools. Included is an emulator that shows what the current web page looks like on various mobile phone browsers. It even includes a button to show what happens when the device is rotated. This is great help for when we are working on Canvas pages and want to see what they look like in the browser (not the app). I made a video showing how to access this neat tool:
I have been teaching in a technology-mediated environment since the days of HyperCard and teach classes in history, online student success, and how to be a health care IT trainer. Every day I learn more about Canvas.