So I'm playing around with keyboard event handlers in JavaScript, and I notice that Mozilla has a field called isChar documented. isChar becomes is true when the key is a character.

Simple enough, right?

Well... no. From the linked documentation:

There is currently a known bug affecting the return result, which is always false and never true. Please see the discussion link in the sidebar for more details.

Fortunately it's a known bug. Well, sort of. It's actually still marked "NEW" meaning no one at Mozilla has verified it exists. Or even looked at it.

Since October 2005. Two years ago.

Sigh.