From 94d2dbf95fdb711f224ce6870d6b9552cc609414 Mon Sep 17 00:00:00 2001
From: Jens Lechtenboerger <jens.lechtenboerger@fsfe.org>
Date: Sun, 2 Dec 2018 20:25:38 +0100
Subject: [PATCH] ox-html: New property HTML_HEADLINE_CLASS for class of
 headline

* lisp/ox-html.el (org-html-headline): Add new property
HTML_HEADLINE_CLASS to assign class attribute to headline.

* doc/org-manual.org (CSS support): Document new property
HTML_HEADLINE_CLASS.
---
 doc/org-manual.org | 4 +++-
 etc/ORG-NEWS       | 3 +++
 lisp/ox-html.el    | 9 +++++++--
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index b5b071386..231315a32 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -12813,10 +12813,12 @@ around them.  Both of these approaches can avoid referring to an
 external file.
 
 #+cindex: @samp{HTML_CONTAINER_CLASS}, property
+#+cindex: @samp{HTML_HEADLINE_CLASS}, property
 In order to add styles to a sub-tree, use the =HTML_CONTAINER_CLASS=
 property to assign a class to the tree.  In order to specify CSS
 styles for a particular headline, you can use the ID specified in
-a =CUSTOM_ID= property.
+a =CUSTOM_ID= property.  You can also assign a specific class to
+a headline with the =HTML_HEADLINE_CLASS= property.
 
 Never change the ~org-html-style-default~ constant.  Instead use other
 simpler ways of customizing as described above.
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 046244788..f9bea4b56 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -42,6 +42,9 @@ See [[git:3367ac9457]] for details.
 ** New features
 *** Babel
 **** Add LaTeX output support in PlantUML
+*** New property =HTML_HEADLINE_CLASS= in HTML export
+The new property =HTML_HEADLINE_CLASS= assigns a class attribute to
+a headline.
 *** Allow LaTeX attributes and captions for "table.el" tables
 Supported LaTeX attributes are ~:float~, ~:center~, ~:font~ and
 ~:caption~.
diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index 6a81be126..7c836f155 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -2607,7 +2607,10 @@ holding contextual information."
 	     (and (org-export-last-sibling-p headline info)
 		  (format "</%s>\n" html-type))))
 	;; Standard headline.  Export it as a section.
-        (let ((extra-class (org-element-property :HTML_CONTAINER_CLASS headline))
+        (let ((extra-class
+	       (org-element-property :HTML_CONTAINER_CLASS headline))
+	      (headline-class
+	       (org-element-property :HTML_HEADLINE_CLASS headline))
               (first-content (car (org-element-contents headline))))
           (format "<%s id=\"%s\" class=\"%s\">%s%s</%s>\n"
                   (org-html--container headline info)
@@ -2616,9 +2619,11 @@ holding contextual information."
                   (concat (format "outline-%d" level)
                           (and extra-class " ")
                           extra-class)
-                  (format "\n<h%d id=\"%s\">%s</h%d>\n"
+                  (format "\n<h%d id=\"%s\"%s>%s</h%d>\n"
                           level
                           id
+			  (if (not headline-class) ""
+			    (format " class=\"%s\"" headline-class))
                           (concat
                            (and numberedp
                                 (format