body.holmes-debug

  a:not([href]),
  a[href=""]
    outline: 2px solid red

  a[href="#"],
  a[href^="javascript"],
  a:not([title]),
  a[title=""]
    outline: 2px solid #fd0

  img:not([alt]),
  img[alt=""]
    outline: 2px solid red

  label:not([for]),
  label[for=""],
  input:not([name]),
  input[name=""],
  select:not([name]),
  select[name=""],
  textarea:not([name]),
  textarea[name=""],
  abbr:not([title]),
  abbr[title=""],
  [class=""],
  [id=""],
  table:not([summary]),
  table[summary=""]
    outline: 2px solid red

  [style],
  [onclick],
  [onblur],
  [onfocus],
  [onselect],
  [onload],
  [onunload]
    outline: 2px solid #fd0

  applet,
  acronym,
  center,
  dir,
  font,
  strike,
  u,
  big,
  tt,
  marquee,
  plaintext,
  xmp
    border: 2px solid #a9a9a9

  [bgproperties],
  [topmargin],
  [rightmargin],
  [bottommargin],
  [leftmargin]
    outline: 2px solid #a9a9a9

  *[bordercolor],
  *[bordercolordark],
  *[bordercolorlight],
  table[frame]
    border: 2px solid #a9a9a9

  div:empty,
  span:empty,
  li:empty,
  p:empty,
  td:empty,
  th:empty
    border: 2px solid #f10

  a[href="#"]:hover::after,
  a[href^="javascript"]:hover::after,
  a:not([title]):hover::after,
  a[title=""]:hover::after,
  div:empty:hover::after,
  span:empty:hover::after,
  li:empty:hover::after,
  p:empty:hover::after,
  td:empty:hover::after,
  th:empty:hover::after,
  [style]:hover::after
    border-radius: 0.5em
    display: block
    padding: 1em
    margin: 1em
    background: #fd0
    position: fixed
    color: #000
    left: 0
    top: 0
    z-index: 9999

  a:not([href]):hover::after,
  a[href=""]:hover::after,
  img:not([alt]):hover:after,
  img[alt=""]:hover::after,
  label:not([for]):hover::after,
  label[for=""]:hover::after,
  input:not([name]):hover::after,
  input[name=""]:hover::after,
  select:not([name]):hover::after,
  select[name=""]:hover::after,
  textarea:not([name]):hover::after,
  textarea[name=""]:hover::after,
  abbr:not([title]):hover::after,
  abbr[title=""]:hover::after,
  [class=""]:hover::after,
  [id=""]:hover::after,
  table:not([summary]):hover::after,
  table[summary=""]:hover::after
    border-radius: 0.5em
    display: block
    padding: 1em
    margin: 1em
    background: red
    position: fixed
    color: #000
    left: 0
    top: 0
    z-index: 9999
    text-decoration: none

  applet:hover::after,
  acronym:hover::after,
  center:hover::after,
  dir:hover::after,
  font:hover::after,
  strike:hover::after,
  big:hover::after,
  tt:hover::after,
  marquee:hover::after,
  plaintext:hover::after,
  xmp:hover::after,
  *[bordercolor]:hover::after,
  *[bordercolordark]:hover::after,
  *[bordercolorlight]:hover::after,
  table[frame]:hover::after
    border-radius: 0.5em
    display: block
    padding: 1em
    margin: 1em
    background: red
    position: fixed
    background: #a9a9a9
    color: #000
    left: 0
    top: 0
    z-index: 9999

  &[bgproperties]:hover::after,
  &[topmargin]:hover::after,
  &[rightmargin]:hover::after,
  &[bottommargin]:hover::after,
  &[leftmargin]:hover::after
    border-radius: 0.5em
    display: block
    padding: 1em
    margin: 1em
    background: red
    position: fixed
    background: #a9a9a9
    color: #000
    bottom: 0
    right: 0
    z-index: 9999

  td:empty:hover::after,
  th:empty:hover::after
    top: 4em

  a:not([href]):hover::after,
  a[href=""]:hover::after
    content: "Missing href attribute"

  a[href="#"]:hover:after
    content: "href='#'"

  a[href^="javascript"]:hover:after
    content: "href has JavaScript"

  a:not([title]):hover::after,
  a[title=""]:hover::after
    content: "Missing title attribute"


  img:not([alt]):hover::after,
  img[alt=""]:hover::after
    content: "Missing alt attribute"

  label:not([for]):hover::after,
  label[for=""]:hover::after
    content: "Missing for attribute"

  input:not([name]):hover::after,
  input[name=""]:hover::after,
  select:not([name]):hover::after,
  select[name=""]:hover::after,
  textarea:not([name]):hover::after,
  textarea[name=""]:hover::after
    content: "Missing name attribute"

  abbr:not([title]):hover::after,
  abbr[title=""]:hover::after
    content: "Missing title attribute"

  [class=""]:hover::after
    content: "Blank class attribute"

  [id=""]:hover::after
    content: "Blank id attribute"

  table:not([summary]):hover::after,
  table[summary=""]:hover::after
    content: "Missing summary attribute"

  [style]:hover::after
    content: "Element has inline styles"

  applet:hover::after,
  acronym:hover::after,
  center:hover::after,
  dir:hover::after,
  font:hover::after,
  strike:hover::after,
  big:hover::after,
  tt:hover::after,
  marquee:hover::after,
  plaintext:hover::after,
  xmp:hover::after
    content: "Deprecated or Non-W3C element"

  &[bgproperties]:hover::after
    content: "Deprecated or Non-W3C body attribute bgproperties"

  &[topmargin]:hover::after,
  &[rightmargin]:hover::after,
  &[bottommargin]:hover::after,
  &[leftmargin]:hover::after
    content: "Deprecated or Non-W3C body attribute *margin"

  *[bordercolor]:hover::after,
  *[bordercolordark]:hover::after,
  *[bordercolorlight]:hover::after
    content: "Deprecated or Non-W3C body attribute bordercolor"

  table[frame]:hover::after
    content: "Deprecated or Non-W3C attribute frame"

  div:empty:hover::after,
  span:empty:hover::after,
  li:empty:hover::after,
  p:empty:hover::after,
  td:empty:hover::after,
  th:empty:hover::after
    content: "Empty element!"