--- a/eric7/Plugins/DocumentationPlugins/Ericdoc/EricdocConfigDialog.py	Sun Sep 12 17:30:38 2021 +0200
+++ b/eric7/Plugins/DocumentationPlugins/Ericdoc/EricdocConfigDialog.py	Sun Sep 12 20:22:27 2021 +0200
@@ -61,9 +61,7 @@
         self.__initializeDefaults()
         
         self.sampleText = self.tr(
-            '''<?xml version="1.0" encoding="utf-8"?>'''
-            '''<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"'''
-            '''"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">'''
+            '''<!DOCTYPE html'''
             '''<html><head>'''
             '''<title></title>'''
             '''</head>'''
@@ -395,7 +393,7 @@
         color = QColorDialog.getColor(QColor(self.colors[colorKey]))
         if color.isValid():
             self.colors[colorKey] = color.name()
-            self.sample.setHtml(self.sampleText.format(self.colors))
+            self.sample.setHtml(self.sampleText.format(**self.colors))
 
     @pyqtSlot()
     def on_bodyFgButton_clicked(self):