No reason for me to try to pick out specific characters. I won't notice. Plus, it won't work for zero width characters, and I might miss it for really tiny on

No reason for me to try to pick out specific characters. I won't notice. Plus, it won't work for zero width characters, and I might miss it for really tiny ones. Give me a popup warning explaining the problem when I try to visit the site, same as I get for certificate problems.