anchor.diff:       novalidate target autocomplete)
       (html manifest)
       (iframe src srcdoc name width height sandbox seamless)
  -    (img src alt height width usemap ismap border)
  +    (img src alt height width usemap ismap border crossorigin
  +     srcset sizes)
       (input name disabled form type maxlength readonly size value
        autocomplete autofocus list pattern required placeholder
        dirname checked multiple src height width
  
positive.code:     (q cite)
      (script type language src defer async charset language)
      (select name disabled form size multiple autofocus required)
      (source src type media)
      (style type media scoped)
      (table border)
      (td colspan rowspan
  
negative.code:     figcaption figure footer form head h1 h2 h3 h4 h5 h6 header
      hgroup hr html i iframe img input ins kbd keygen label legend li
      link main map mark menu meta meter nav noscript object ol
      optgroup option output p param picture pre progress q rp rt ruby s samp
      script section select small source span strong style sub summary
      sup table tbody td textarea tfoot th thead time title tr
      track u ul var video wbr))
  