Using Chrome DevTools
To use Google Chrome Developer Tools, all you have to do is open a page with Google Chrome. From ‘Chrome menu’, select ‘Tools’ followed by ‘Developer Tools’. You can also right-click on a page element and select ‘Inspect Element’. You can also use your keyboard by selecting ctl+shift+i on Windows-based devices or cmnd+opt+i on Mac. DevTools are grouped in a toolbar at the top of the browser window. You can then work with a specific type of page or app information under several groups of tools, including elements, profiles, console, resources, network, timeline, audits and sources. Each tool makes it easy for you to troubleshoot issues, improve network performance, and get information about what needs to be done to improve your site. They also let you see your size with different screen sizes and resolutions.
A great tool for troubleshooting and improving your site