code: @SafeVarargs
      public static Attribute<HtmlTag> head( String tag, Consumer<HtmlTag> content, Attribute<Void>... attributes )
      {
          return new HeadTag( tag, content, attributes );
      }
docs: Generate html tags for use in {@link HtmlTag.Html#head &lt;head&gt;}.
  
  This is an alternative to {@code html.head( title -> "my title" )}, allowing the use of the API on earlier
  builds of the JDK as {@code html.head( head( "title", title -> title.text( "my title" ) ) )}.
  
  @param tag        the name of the head tag.
  @param content    generator for the content of the head tag.
  @param attributes the attributes of the head tag.
  @return an object that generates the tag in the head.