docs/_plugins/panel.rb

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module Jekyll
  class PanelTag < Liquid::Tag

    def initialize(tag_name, text, tokens)
      super
      @text = text
    end

    def render(context)
    	@text = @text.strip! || @text if !@text.nil?
      "<div class=\"panel panel-default\"><div class=\"panel-body\" markdown=\"span\">#{@text}</div></div>"
    end
  end
end

Liquid::Template.register_tag('panel', Jekyll::PanelTag)