tinymce responsive

This tuttorial explains how to make images,tables etc. responsive in tinymce html editor. 

Step 1 :  open file  "css/content.css"  and then write css class that is responsive in order to enable tinymce to select this class.

 // Example content CSS (should be your site CSS)

content_css : "css/content.css", 

Step 2 : as an example, while editing imge on pop up  form the css class will be visible. It is also same for a table.

screenshot