<col> elements within a <colgroup> are getting indented incorrectly

[marcushellberg]

Col elements within a <colgroup> get indented incorrectly.

Input:
<colgroup><col><col><col></colgroup>

Expected:

<colgroup>
  <col>
  <col>
  <col>
</colgroup>

Actual:

<colgroup>
  <col>
    <col>
      <col>
</colgroup>

[bitwiseman]

Same thing happens with <li> elements right now as well.

[bitwiseman]

Here's the list of all the optional tags.

https://www.w3.org/TR/html5/syntax.html#optional-tags

A real solution will require understanding all these. In the short term, it probably makes sense to just pick the most used ones, like li and col.