Function hyphenate

Hyphenates camel-cased string.

Applicable to CSS property names.

Converts:

• backgroundColor to background-color.

  Uppercase letters converted to lower case and prepended by hyphen,

• MozTransition to -moz-transition.

  The very first uppercase letter is prepended by hyphen too.

• MSTransition to -ms-transition.

  Subsequent upper-case letters converted to lower case. The first and the last ones prepended by hyphen.

• someURL to some-url

  Subsequent upper-case letters in the very end of the string converted to lower case and prepended by hyphen.

• color to color.

  All lower-case names remain as is.

• padding-left to padding-left

The leading upper-case letter is not prepended by hyphen. Thus, e.g. MozTransition would be converted to moz-transition rather to -moz-transition.