I need to create an alert asking the user if they really want to uncheck a checkbox on a form.  (The default value of the checkbox is No)  I am new to using JavaScript in CRM - would anyone point me to examples of how this would work, or tutorials on using JavaScript in CRM?  We are using Dynamics 365 online.
Many thanks!
  
                            
                         
                        
                        
                            
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