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<!DOCTYPE html>
<html>
<head>
<style>
[contenteditable] {
  outline: 0px solid transparent;
}
</style>
</head>
<body>
<h2>Remove Contenteditable Border</h2>
<p contenteditable="true">This is an editable paragraph. Normally I have a border around me on focus, but not today!</p>
</body>
</html>