diacritic

Drop some of those diacritic stacks into Twitter and check out the mayhem.

They should have specified Turkish alphabet to use ı and a diacritic to make the dotted one.

There are a lot of diacritics to choose from if you don't know all their names, and that's assuming you even catch on that it's supposed to be a diacritic.

In any case, most computer users in Israel don't even know how to add diacritic marks, so I don't see anyone typing such an address in their browser.

∑ looks like a sideways 'W", the trademark symbol is just a circled r, and the diacritic marks fit the character you'd commonly associate them with.

There are also some languages that routinely use more than one stacked diacritic on letters and encoding every possible precomposed variant would be at least a little bit silly.

I realized I probably write more curly braces than accented characters during the day and switched to using an US-International style keyboard layout that puts the diacritic characters under the Alt Gr key.

There are a lot of code points that would need to be filtered out if you do this - Noncharacters, Control codes, High/Low surrogates, Private-Use, Whitespace, and then of course the ones that mutate other code points in the sequence - Bidirectional, Combining characters / diacritical marks.