diff -r c02818d7e29f -r 7e61baa047f0 docutil/dochtml.py
--- a/docutil/dochtml.py	Mon Aug 14 22:30:41 2017 +0300
+++ b/docutil/dochtml.py	Mon Aug 14 23:27:15 2017 +0300
@@ -29,6 +29,7 @@
 
 HtmlFrameOpened = []
 
+
 def OpenHtmlFrame(self, title, file, size):
         if title not in HtmlFrameOpened:
             HtmlFrameOpened.append(title)
@@ -41,12 +42,14 @@
 [ID_HTMLFRAME, ID_HTMLFRAMEHTMLCONTENT] = [wx.NewId() for _init_ctrls in range(2)]
 EVT_HTML_URL_CLICK = wx.NewId()
 
+
 class HtmlWindowUrlClick(wx.PyEvent):
     def __init__(self, linkinfo):
         wx.PyEvent.__init__(self)
         self.SetEventType(EVT_HTML_URL_CLICK)
         self.linkinfo = (linkinfo.GetHref(), linkinfo.GetTarget())
 
+
 class UrlClickHtmlWindow(wx.html.HtmlWindow):
     """ HTML window that generates and OnLinkClicked event.
 
@@ -61,6 +64,7 @@
         else:
             wx.html.HtmlWindow.Bind(event, handler, source=source, id=id, id2=id2)
 
+
 class HtmlFrame(wx.Frame):
         def _init_ctrls(self, prnt):
             wx.Frame.__init__(self, id=ID_HTMLFRAME, name='HtmlFrame',