Support completion of HTML tags in CSS selectors

* lisp/textmodes/css-mode.el (css--html-tags): New variable holding a
list of HTML tags for completion.
(css--nested-selectors-allowed): New variable for determining whether
nested selectors are allowed in the current mode.
(css--complete-selector): New function for completing part of a CSS
selector.
(css-completion-at-point): Support completion of selectors.
(scss-mode): Allow nested selectors.

1 files changed, 2 insertions, 2 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 21602ff954c..e2026121b95 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -282,8 +282,8 @@ different group ID.
 ** CSS mode
 
 ---
-*** Support for completing attribute values and bang-rules using the
-'completion-at-point' command.
+*** Support for completing attribute values, at-rules, bang-rules, and
+HTML tags using the 'completion-at-point' command.
 
 +++
 ** Emacs now supports character name escape sequences in character and