Allow toggling colors in eww

* doc/misc/eww.texi (Basics): Mention "C".

* lisp/net/eww.el (eww-toggle-colors): New command and keystroke.

* lisp/net/shr.el (shr-use-colors): New variable.
(shr-colorize-region): Use it.

4 files changed, 32 insertions, 1 deletions

diff --git a/doc/misc/eww.texi b/doc/misc/eww.texi
index f1347b7b3bb..15cc867dc7f 100644
--- a/doc/misc/eww.texi
+++ b/doc/misc/eww.texi
@@ -109,6 +109,12 @@ only display this part.  This usually gets rid of menus and the like.
   The @kbd{F} command (@code{eww-toggle-fonts}) toggles whether to use
 variable-pitch fonts or not.  This sets the @code{shr-use-fonts} variable.
 
+@findex eww-toggle-colors
+@findex shr-use-colors
+@kindex F
+  The @kbd{C} command (@code{eww-toggle-colors}) toggles whether to use
+HTML-specified colors or not.  This sets the @code{shr-use-colors} variable.
+
 @findex eww-download
 @vindex eww-download-directory
 @kindex d
diff --git a/etc/NEWS b/etc/NEWS
index 1ef496c62d0..76fac3e03cd 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -524,6 +524,11 @@ whether to use variable-pitch fonts or not.  The user can also
 customize the `shr-use-fonts' variable.
 
 +++
+*** A new command `C' (`eww-toggle-colors) can be used to toggle
+whether to use the HTML-specified colors or not.  The user can also
+customize the `shr-use-colors variable.
+
++++
 *** A new command `R' (`eww-readable') will try do identify the main
 textual parts of a web page and display only that, leaving menus and
 the like off the page.
diff --git a/lisp/net/eww.el b/lisp/net/eww.el
index 742e1e4d1c0..0bd60367f65 100644
--- a/lisp/net/eww.el
+++ b/lisp/net/eww.el
@@ -681,6 +681,7 @@ the like."
     (define-key map "E" 'eww-set-character-encoding)
     (define-key map "S" 'eww-list-buffers)
     (define-key map "F" 'eww-toggle-fonts)
+    (define-key map [(meta C)] 'eww-toggle-fonts)
 
     (define-key map "b" 'eww-add-bookmark)
     (define-key map "B" 'eww-list-bookmarks)
@@ -705,6 +706,8 @@ the like."
         ["Add bookmark" eww-add-bookmark t]
         ["List bookmarks" eww-list-bookmarks t]
         ["List cookies" url-cookie-list t]
+        ["Toggle fonts" eww-toggle-fonts t]
+        ["Toggle colors" eww-toggle-colors t]
        ["Character Encoding" eww-set-character-encoding]))
     map))
 
@@ -1495,6 +1498,15 @@ If CHARSET is nil then use UTF-8."
              "off"))
   (eww-reload))
 
+(defun eww-toggle-colors ()
+  "Toggle whether to use HTML-specified colors or not."
+  (interactive)
+  (message "Colors are now %s"
+           (if (setq shr-use-colors (not shr-use-colors))
+               "on"
+             "off"))
+  (eww-reload))
+
 ;;; Bookmarks code
 
 (defvar eww-bookmarks nil)
diff --git a/lisp/net/shr.el b/lisp/net/shr.el
index a7fdf9e1181..3d5f02c359b 100644
--- a/lisp/net/shr.el
+++ b/lisp/net/shr.el
@@ -63,6 +63,12 @@ fit these criteria."
   :group 'shr
   :type 'boolean)
 
+(defcustom shr-use-colors t
+  "If non-nil, respect color specifications in the HTML."
+  :version "25.2"
+  :group 'shr
+  :type 'boolean)
+
 (defcustom shr-table-horizontal-line nil
   "Character used to draw horizontal table lines.
 If nil, don't draw horizontal table lines."
@@ -1082,7 +1088,9 @@ ones, in case fg and bg are nil."
                (shr-color-visible bg fg)))))))
 
 (defun shr-colorize-region (start end fg &optional bg)
-  (when (and (or fg bg) (>= (display-color-cells) 88))
+  (when (and shr-use-colors
+             (or fg bg)
+             (>= (display-color-cells) 88))
     (let ((new-colors (shr-color-check fg bg)))
       (when new-colors
         (when fg