I have a site testing for compatibility issues and responsive designs on IE,Chrome,Firefox,Safari.
In Firefox the testing was completed with ease as it had the developer options and there by pressing the Ctrl+m gives you get the different resolution screen.
The same is not applicable for IE,Safari. Under Google Chrome I tried the Inspect Element and then the Toogle device mode and is slightly difficult.
I have to test the responsive design without using any tool so could you please suggest me on How the above can be done