How to check for errors on the browser console?

Hotkey for launching Chrome DevTools:

• Windows: F12 or CTRL + Shift + I
• macOS : Cmd + Opt + I

You can also open Chrome DevTools from the tools menu in your browser:

Make sure you are on the " Console" tab and note that we are only looking for errors. Select the "error" category from the left-side panel to filter other not-so-important warnings and notices.

This process is similar for the Firefox browser.