HTML Validation Issue: Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents.
I want to use the character  as my submit character. I am getting a validation warning:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Demo</title>
</head>
<body>
<div>
<input type="submit" class="fa submit" value="">
</div>
</body>
</html>SOLUTION
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Awarded points since this warning can be ignored.
You could build a database of items like 1 = , 2 =  etc. Then just post 1,2,3... and in your server side code, convert the 1 to  to display the content. But like I said, it is just a warning.