A common pattern these days, is to put bullets as a field’s placeholder to indicate a credit card number, a discount or a password field. The problem is that, if you just put
•••• •••• •••• ••••, the bullets end up too close to each other, so we need to add a bit of letter-spacing for these fields only.
Here’s a snippet of CSS that does just that:
Targetting placeholders with just one bullet would work just as well, but by targetting four bullets we make sure that a placeholder that contains just one bullet (and some text maybe) wouldn’t be affected by this. ↩