A hard refresh clears your browser cache for a specific page, which forces it to load the most recent version of that page including any new scripts, styles or features.
Clicking the “Refresh” arrow on your browser address bar is not a hard refresh.
How to clear your cache through a hard refresh on any browser:
Google Chrome
Windows users: hold down Ctrl and then press F5 on your keyboard
Mac users: hold down Cmd and Shift and then press R on your keyboard
Firefox
For Windows users: hold down Ctrl and then press F5 on your keyboard
Mac users: hold down Cmd and Shift and then press R on your keyboard
Safari (Mac)
Go to Safari > Empty Cache, or hit Opt + Cmd + E
To refresh, click the refresh button on the address bar or press Cmd + R
Internet Explorer/Microsoft Edge (Windows)
Hold down Ctrl and then press F5 on your keyboard