Symptoms
Non-Latin characters in a web page (for example: ß, 猫, ✌️) don't render correctly.
Cause
If a web page doesn't explicitly specify a character encoding, then the browser may default to a Latin character encoding that doesn't support non-Latin characters.
Resolution
If the web page is one that you control (i.e. it's your website), add the HTML element <meta charset="utf-8">
to the page's <head> to set the character encoding to UTF-8, like this:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
ß, 猫, ✌️
</body>
</html>