While such matters may seem trivial, those who use a programming or markup language on a daily basis would benefit from the language being as consistent, and predictable, as possible. For instance, PHP has been roundly criticized for having an inconsistent syntax. Because PHP function names vary from one to the next in how they are formatted -- sometimes they have underscores and sometimes they don't -- programmers have more difficulty remembering or guessing the names of PHP functions, forcing them to consult documentation.
Designers who have an opinion about how CSS variables should be formatted should make their thoughts known within the next few weeks. The CSS Variables specification will remain in a working draft status for the next three weeks or so. This is the time when the group will be in the best position to mull new ideas, Atkins explained by an e-mail message.