fix: HTML4::Document.to_xhtml self-closing tags

Commit 1d06b4f introduced NO_EMPTY_TAGS into SaveOptions::DEFAULT_XHTML which libxml2 ignored due to a long-standing bug in serialization. libxml2 v2.9.11 fixed that serialization bug (https://gitlab.gnome.org/GNOME/libxml2/-/commit/dc6f009) and started paying attention to the NO_EMPTY_TAGS save option, resulting in seeing output containing, e.g. `<col></col>` instead of `<col/>`. This commit updates the default XHTML save options to drop the NO_EMPTY_TAGS flag, restoring this behavior. Closes #2324
sparklemotion · Sep 23, 2021 · 7376cbd · 7376cbd
1 parent c4a9de4
commit 7376cbd
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diff --git a/lib/nokogiri/xml/node/save_options.rb b/lib/nokogiri/xml/node/save_options.rb
@@ -34,7 +34,7 @@ class SaveOptions
           DEFAULT_HTML = FORMAT | NO_DECLARATION | NO_EMPTY_TAGS | AS_HTML
         end
         # the default for XHTML document
-        DEFAULT_XHTML = FORMAT | NO_DECLARATION | NO_EMPTY_TAGS | AS_XHTML
+        DEFAULT_XHTML = FORMAT | NO_DECLARATION | AS_XHTML
 
         # Integer representation of the SaveOptions
         attr_reader :options

diff --git a/test/html4/test_document.rb b/test/html4/test_document.rb
@@ -372,6 +372,15 @@ def test_to_xhtml
           assert_match("UTF-8", html.to_xhtml(encoding: "UTF-8"))
         end
 
+        def test_to_xhtml_self_closing_tags
+          # https://github.com/sparklemotion/nokogiri/issues/2324
+          html = "<html><body><br><table><colgroup><col>"
+          doc = Nokogiri::HTML::Document.parse(html)
+          xhtml = doc.to_xhtml
+          assert_match(%r(<br ?/>), xhtml)
+          assert_match(%r(<col ?/>), xhtml)
+        end
+
         def test_no_xml_header
           html = Nokogiri::HTML(<<~EOHTML)
             <html>