How to access the browser console
Chrome
To open the developer console window on Chrome, use the keyboard shortcut Cmd-Shift-J on Windows or Cmd-Option-J on a Mac.
Edge
To open the console on Edge, hit F12 to access the Developer Tools. Once in the Developer Tools, navigate to the Console tab.
Firefox
To open the console on Firefox, use the keyboard shortcut Cmd-Shift-K on Windows or Cmd-Option-K on a Mac. The toolbox will appear at the bottom of the browser window, with the Web Console activated.
Safari
To open the console on Safari, you will first need to turn on the Develop menu. To do this, open the Safari menu in the Mac menu bar, then select Preferences. Once in the Preferences dialog, navigate to the Advanced tab, then check the "Show Develop menu in the menu bar" box.
Once the Develop menu has been enabled, you can go to the Develop menu in the menu bar and then select the "Show JavaScript Console" option. The JavaScript Console will show up on the bottom half of the active browser window.