anchor.diff:            input(list="b" placeholder="select it or type it")
             datalist#b
               option option 1
  -            optgroup(label="label for option 2")
  -              option option 2a
  -              option option 2b
  -              option option 2c
  +            //- optgroup not a valid child of datalist
  +            option option 2
               option option 3
         figure(class=classnames.figure)
           fieldset
  
positive.code:       figure(class=classnames.figure)
          fieldset
            legend date/time
            input(type="datetime" placeholder="input type datetime")
            input(type="datetime-local" placeholder="input type datetime-local")
            input(type="date" placeholder="input type date")
            input(type="time" placeholder="input type time")
            input(type="week" placeholder="input type week")
            input(type="month" placeholder="input type month")
        figure(class=classnames.figure)
          fieldset
            legend without text input
            input(type="color" placeholder="input type color")
            input(type="file" placeholder="input type file")
            input(type="hidden" placeholder="input type hidden")
            input(type="number" placeholder="input type number")
            input(type="range" placeholder="input type range")
        figure(class=classnames.figure)
          fieldset
            legend check boxes
            input(type="checkbox" placeholder="input type checkbox")
            label select
            label
              input(type="checkbox" placeholder="input type checkbox")
              | all
            input(type="checkbox" placeholder="input type checkbox")
            label applicable
        figure(class=classnames.figure)
          fieldset
            legend radio buttons
            input(type="radio" name="radiogroup1" placeholder="input type radio")
            label select
            label
              input(type="radio" name="radiogroup1" placeholder="input type radio")
              | only
            input(type="radio" name="radiogroup1" placeholder="input type radio")
            label one
        figure(class=classnames.figure)
          fieldset
  
negative.code:       figure(class=classnames.figure)
          fieldset
            legend buttons
            input(type="button" value="button")
            input(type="reset")
            input(type="submit")
            button(type="button") button
            button(type="reset")  reset
            button(type="submit") submit
  