I see a few other questions on here with the same title, but none of them explain how to fix this issue.
Whenever I have special characters in my document through the use of HTML entities, the validator gives me the warning "Text run is not in Unicode Normalization Form C."
Example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Test page</title>
</head>
<body>
Ω
</body>
</html>
You can try it out yourself, here: http://validator.w3.org/check
Why am I getting the validation warning and what should I do to fix it?