     ''').serialize()
   expectedSerialization = '''<document><block
       precedence="1"
-      color="return"
+      color="lightblue"
       socketLevel="0"
       classes="body">&amp;lt;body <socket
       precedence="0"

    ''').serialize()
  expectedSerialization = '''<document><block
      precedence="1"
      color="cyan"
      socketLevel="0"
      classes="#documentType">&amp;lt;!doctype html&amp;gt;</block>
    <block
      precedence="1"
      color="amber"
      socketLevel="0"
      classes="html">&amp;lt;html&amp;gt;<indent
      prefix="  "
      classes="html">
    <block
      precedence="1"
      color="cyan"
      socketLevel="0"
      classes="head">&amp;lt;head&amp;gt;<indent
      prefix="  "
      classes="head">
    <block
      precedence="1"
      color="green"
      socketLevel="0"
      classes="title">&amp;lt;title&amp;gt;<indent
      prefix="  "
      classes="title"><block
      precedence="1"
      color="cyan"
      socketLevel="0"
      classes="#text"><socket
      precedence="0"

    ''').serialize()
  expectedSerialization = '''<document><block
      precedence="1"
      color="lightblue"
      socketLevel="0"
      classes="body">&amp;lt;body <socket
      precedence="0"
