I use tinymce for a webpage that dynamically generates at least 5 texts. The configuration I use only works on the first textarea unfortunately.
textarea
For TinyMCE 4.0 you have to use a selector or defining a tinymce.init object/method for each desired configuration (https://www.tinymce.com/docs/get-started/multiple-editors/).
For example, this is a page with 3 editors:
This Title Can Be Edited If You Click Here This section1 of content can be edited... This section2 of content can be edited...
This section1 of content can be edited...
This section2 of content can be edited...