More about point 1 here: https://stackoverflow.com/a/6153129 https://stackoverflow.com/a/6153129 The argument with the most weight right now is probably that e

More about point 1 here: https://stackoverflow.com/a/6153129 https://stackoverflow.com/a/6153129 The argument with the most weight right now is probably that everyone uses dashes and there are no significant advantages to using underscores. So, to help the web a little more consistent, just use dashes (unless you have some unusually good reason not to).