bug#36475: [PATCH] Handle 'abbr' and 'acronym' tags in shr.el

[Nicholas Drozd <nicholasdrozd@gmail.com>]

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Thanks for the comments, Basil. Attached is a revised patch that
covers everything <abbr title="as far as I can tell">AFAICT</abbr>.

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From 05cc14641fa7f193ebcdb6548c03e293b4511d47 Mon Sep 17 00:00:00 2001
From: Nick Drozd <nicholasdrozd@gmail.com>
Date: Mon, 1 Jul 2019 23:46:10 -0500
Subject: [PATCH] Handle 'abbr' and 'acronym' tags in shr.el

* lisp/net/shr.el (shr-tag-abbr, shr-tag-acronym): New functions
handling 'abbr' and 'acronym' tags, respectively.
* etc/NEWS: Announce change in shr behavrior.
---
 etc/NEWS        |  2 +-
 lisp/net/shr.el | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/etc/NEWS b/etc/NEWS
index abbece374a..852b6e4948 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -987,7 +987,7 @@ This attribute is meant to tell screen readers to ignore a tag.
 *** 'shr-tag-ol' now respects the ordered list 'start' attribute.
 
 ---
-*** The <code ...> tag is now handled.
+*** The following tags are now handled: <code>, <abbr>, and <acronym>.
 
 ** Htmlfontify
 
diff --git a/lisp/net/shr.el b/lisp/net/shr.el
index 7fdb3212d4..9897e59e1e 100644
--- a/lisp/net/shr.el
+++ b/lisp/net/shr.el
@@ -159,6 +159,12 @@ shr-selected-link
   :version "27.1"
   :group 'shr)
 
+(defface shr-abbreviation
+  '((t :inherit underline :underline (:style wave)))
+  "Face for <abbr> elements."
+  :version "27.1"
+  :group 'shr)
+
 (defvar shr-inhibit-images nil
   "If non-nil, inhibit loading images.")
 
@@ -1470,6 +1476,21 @@ shr-tag-a
     (when url
       (shr-urlify (or shr-start start) (shr-expand-url url) title))))
 
+(defun shr-tag-abbr (dom)
+  (when-let* ((title (dom-attr dom 'title))
+	      (start (point)))
+    (shr-generic dom)
+    (shr-add-font start (point) 'shr-abbreviation)
+    (add-text-properties
+     start (point)
+     (list
+      'help-echo title
+      'mouse-face 'highlight))))
+
+(defun shr-tag-acronym (dom)
+  ;; `acronym' is deprecated in favor of `abbr'.
+  (shr-tag-abbr dom))
+
 (defun shr-tag-object (dom)
   (unless shr-inhibit-images
     (let ((start (point))
-- 
2.17.1