GitLab

* lisp/textmodes/css-mode.el (css-bang-ids): New defconst holding CSS
identifiers on the form !foo.
(scss-bang-ids): New defconst holding SCSS identifiers on the form
!foo.
(css--font-lock-keywords): Highlight the new SCSS bang identifiers in
`font-lock-builtin-face'.

* test/indent/css-mode.css: Add bang rule test case.

* test/indent/scss-mode.css: Add test cases for the introduced bang
rules.