Use Dev Console
https://www.hacker101.com/sessions/javascript_for_hackers.html
https://dev.to/saraahmed626/8-way-to-test-debug-your-web-apps-using-browsers-39pj
https://hurricanelabs.com/blog/console-wars-part-1-hacks-for-hackers/
https://adequatica.medium.com/browser-console-for-functional-testing-650004cc4641