doc/misc/{gnus.texi,gnus-faq.texi}: Add link to EWW manual

* gnus.texi (HTML): Update section so that it mentions shr and w3m.
Also link the full EWW manual that explains more on shr, too.

* gnus-faq.texi (FAQ 4 - Reading messages, FAQ 4-16): Add Q&A on how to
increase contrast when displaying HTML mail with shr.

3 files changed, 43 insertions, 10 deletions

diff --git a/doc/misc/ChangeLog b/doc/misc/ChangeLog
index 441285647bd..20b124f89cb 100644
--- a/doc/misc/ChangeLog
+++ b/doc/misc/ChangeLog
@@ -1,5 +1,11 @@
 2014-11-07  Tassilo Horn  <tsdh@gnu.org>
 
+        * gnus.texi (HTML): Update section so that it mentions shr and w3m.
+        Also link the full EWW manual that explains more on shr, too.
+
+        * gnus-faq.texi (FAQ 4 - Reading messages, FAQ 4-16): Add Q&A on how to
+        increase contrast when displaying HTML mail with shr.
+
         * eww.texi (Advanced): Document increasing contrast with
         shr-color-visible-distance-min and
         shr-color-visible-luminance-min.
diff --git a/doc/misc/gnus-faq.texi b/doc/misc/gnus-faq.texi
index fd4f427431d..83fff5e9497 100644
--- a/doc/misc/gnus-faq.texi
+++ b/doc/misc/gnus-faq.texi
@@ -742,6 +742,7 @@ POP3 mail source.  See @pxref{Mail Source Specifiers} for VALUE.
 * FAQ 4-14::    I don't like the way the Summary buffer looks, how to
                 tweak it?
 * FAQ 4-15::    How to split incoming mails in several groups?
+* FAQ 4-16::    How can I ensure more contrast when viewing HTML mail?
 @end menu
 
 @node FAQ 4-1
@@ -1185,6 +1186,21 @@ from using them):
 @end example
 @noindent
 
+@node FAQ 4-16
+@subsubheading Question 4.16
+
+How can I ensure more contrast when viewing HTML mail?
+
+@subsubheading Answer
+
+Gnus' built-in simple HTML renderer (you use it if the value of
+@code{mm-text-html-renderer} is @code{shr}) uses the colors which are
+declared in the HTML mail.  However, it adjusts them in order to
+prevent situations like dark gray text on black background.  In case
+the results still have a too low contrast for you, increase the values
+of the variables @code{shr-color-visible-distance-min} and
+@code{shr-color-visible-luminance-min}.
+
 @node FAQ 5 - Composing messages
 @subsection Composing messages
 
diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index a25d7c540f3..67d4ed4e9ef 100644
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -11761,20 +11761,31 @@ Also @pxref{MIME Commands}.
 @section @acronym{HTML}
 @cindex @acronym{HTML}
 
-If you have @code{w3m} installed on your system, Gnus can display
-@acronym{HTML} articles in the article buffer.  There are many Gnus
-add-ons for doing this, using various approaches, but there's one
-(sort of) built-in method that's used by default.
-
-For a complete overview, consult @xref{Display Customization,
-,Display Customization, emacs-mime, The Emacs MIME Manual}.  This
-section only describes the default method.
+Gnus can display @acronym{HTML} articles nicely formatted in the
+article buffer.  There are many methods for doing that, but two of
+them are kind of default methods.
+
+If your Emacs copy has been built with libxml2 support, then Gnus uses
+Emacs' built-in, plain elisp Simple HTML Renderer @code{shr}
+@footnote{@code{shr} displays colors as declared in the @acronym{HTML}
+article but tries to adjust them in order to be readable.  If you
+prefer more contrast, have a look at question 4.16 in the
+@xref{Frequently Asked Questions}.} which is also used by Emacs'
+browser EWW (@xref{Top,,,eww}).
+
+If your Emacs copy lacks libxml2 support but you have @code{w3m}
+installed on your system, Gnus uses that to render @acronym{HTML} mail
+and display the results in the article buffer (@code{gnus-w3m}).
+
+For a complete overview, consult @xref{Display Customization, ,Display
+Customization, emacs-mime, The Emacs MIME Manual}.  This section only
+describes the default method.
 
 @table @code
 @item mm-text-html-renderer
 @vindex mm-text-html-renderer
-If set to @code{gnus-article-html}, Gnus will use the built-in method,
-that's based on @code{w3m}.
+If set to @code{shr}, Gnus uses its own simple @acronym{HTML}
+renderer.  If set to @code{gnus-w3m}, it uses @code{w3m}.
 
 @item gnus-blocked-images
 @vindex gnus-blocked-images