Chrome/Safari support css:
-webkit-user-modify:read-write-plaintext-only , which can disable user paste rich text into a contenteditable div.
I do not know how to get it in firefox and IE.
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maybe https://stackoverflow.com/questions/24408028/html5-contenteditable-div-accept-only-plaintext/31627656#31627656 can to some part what you look for. My answer http://stackoverflow.com/a/31627656/1711186 there uses javascript to mimic the plaintext only behaviour – humanityANDpeace Jul 25 '15 at 14:48
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I believe you can use the -moz prefix for firefox
-moz-user-modify: read-write-plaintext-only;
And for IE (10+) you can use the -ms prefix
-ms-user-modify: read-write-plaintext-only;
It would also be proper to add it without the prefix for future proofing ;)
user-modify: read-write-plaintext-only;
gomezruo
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1Sorry, but you believe wrong. Firefox does not support this see https://developer.mozilla.org/en-US/docs/Web/CSS/-moz-user-modify – humanityANDpeace Jul 25 '15 at 14:16
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IE 11 does not support "-ms-user-modify" or "user-modify" styles either – Andrew Marais Jul 04 '16 at 11:30