Convert XML <title> to HTML <span>

app/helpers/arclight/ead_format_helpers.rb

@@ -26,11 +26,19 @@ def transform_ead_to_html(value)
     def ead_to_html_scrubber
       Loofah::Scrubber.new do |node|
         format_render_attributes(node) if node.attr('render').present?
+        convert_to_span(node) if CONVERT_TO_SPAN_TAGS.include? node.name
         format_lists(node) if %w[list chronlist].include? node.name
         node
       end
     end
 
+    # Tags that should be converted to <span> tags because of formatting conflicts between XML and HTML
+    CONVERT_TO_SPAN_TAGS = ['title'].freeze
+
+    def convert_to_span(node)
+      node.name = 'span'
+    end
+
     def condense_whitespace(str)
       str.squish.strip.gsub(/>[\n\s]+</, '><')
     end

spec/controllers/concerns/arclight/ead_format_helpers_spec.rb

@@ -40,6 +40,14 @@ class TestController
       end
     end
 
+    describe 'converts conflicting tags' do
+      # this is needed because browsers apply display:none to <title> tags by default
+      it 'converts <title> tags to <span> tags' do
+        content = helper.render_html_tags(value: %w[<title>Title</title>])
+        expect(content).to eq_ignoring_whitespace '<span>Title</span>'
+      end
+    end
+
     describe 'nodes with @render attributes' do
       it 'altrender custom -> html class' do
         content = helper.render_html_tags(value: ['<emph render="altrender" altrender="my-custom-class">special text</emph>'])