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added 260 characters in body
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For FILTER HTML go to:

/admin/config/content/formats/filtered_html

add <button> to the limit allowed HTML Tags list.

enter image description here

If you use FULL HTML the button should work.

##If not try

go to:

/admin/config/content/ckeditor/edit/Advanced (for Filter HTML)

/admin/config/content/ckeditor/edit/Full (for Full HTML)

Then under Advanced Content Filter, select disabled.

enter image description here

No Sssweat
  • 31.6k
  • 14
  • 55
  • 91