Complete "initial" and "unset" in CSS mode

* lisp/textmodes/css-mode.el (css--complete-property-value): Make
"initial" and "unset" completion candidates for all CSS properties,
just like "inherit".

* test/lisp/textmodes/css-mode-tests.el
(css-test-complete-property-value): Update test to reflect the above
change.

2 files changed, 4 insertions, 2 deletions

diff --git a/lisp/textmodes/css-mode.el b/lisp/textmodes/css-mode.el
index 060af332179..261826e8b26 100644
--- a/lisp/textmodes/css-mode.el
+++ b/lisp/textmodes/css-mode.el
@@ -853,7 +853,8 @@ the string PROPERTY."
         (save-excursion
           (skip-chars-backward "[:graph:]")
           (list (point) end
-                (cons "inherit" (css--property-values property))))))))
+                (append '("inherit" "initial" "unset")
+                        (css--property-values property))))))))
 
 (defvar css--html-tags (mapcar #'car html-tag-alist)
   "List of HTML tags.
diff --git a/test/lisp/textmodes/css-mode-tests.el b/test/lisp/textmodes/css-mode-tests.el
index fd86fd2d878..d2817875956 100644
--- a/test/lisp/textmodes/css-mode-tests.el
+++ b/test/lisp/textmodes/css-mode-tests.el
@@ -111,7 +111,8 @@
     (let ((completions (css-mode-tests--completions)))
       (should
        (equal (seq-sort #'string-lessp completions)
-              '("absolute" "fixed" "inherit" "relative" "static"))))))
+              '("absolute" "fixed" "inherit" "initial" "relative"
+                "static" "unset"))))))
 
 (ert-deftest css-test-complete-pseudo-class ()
   (with-temp-buffer