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<!DOCTYPE html>
<html>
<head>
<style>
::grammar-error {
  text-decoration: underline red;
  color: red;
}
</style>
</head>
<body>
<h1>Demo of ::grammar-error</h1>
<p contenteditable="true" spellcheck="true">This is a praggagraph. It is editable. Try to change the text.</p>
</body>
</html>