JQuery by default is not included in the Chrome Developer Tools.
The below snippet adds the latest version of jQuery to the Chrome Developer Tools.
1. Click F12 to open Chrome Developer Tools
2. Paste the below snippet to add jQuery
javascript:(function(e,s){e.src=s;e.onload=function(){jQuery.noConflict();console.log('jQuery added')};document.head.appendChild(e);})(document.createElement('script'),'//code.jquery.com/jquery-latest.min.js');
3. Write the code jQuery(‘body’) to test jQuery.
4. It all works.