HTML コメントのインデント整形

<!--
  This gets reindented, but we don't parse the content.
  So stuff can be unclosed and it'll be fine.
  <article id="1234">
-->

<!--
  This gets reindented, but we don't parse the content.
  So stuff can be unclosed and it'll be fine.
  <article id="1234">
-->

<!-- if it fits inline, it fits inline -->

It should change the css display of the next node
printWidth: 1
<!-- display: block -->
<span>
  {{ hi }}
</span>

It should preserve MSO conditional comments
<!--[if mso]>
  <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="570" align="center">
  <tr>
  <td bgcolor="#054A49">&nbsp
<![endif]-->

It should support the IE Comment '&' operator
<!--[if (gt IE 5)&(lt IE 7)]>
  <script src="DD_belatedPNG.js"></script>
  <script>
    DD_belatedPNG.fix('.png');
  </script>
<![endif]-->

It should support the IE Comment '|' operator
<!--[if (IE 6)|(IE 7)]>
  <style type="text/css">
  a		{ color:#fff; }
  </style>
<![endif]-->

It should support and indend the bodies of all IE comment variations
<!--[if IE]>
  According to the conditional comment this is IE<br />
<![endif]-->
<!--[if IE 6]>
  According to the conditional comment this is IE 6<br />
<![endif]-->
<!--[if IE 7]>
  According to the conditional comment this is IE 7<br />
<![endif]-->
<!--[if IE 8]>
  According to the conditional comment this is IE 8<br />
<![endif]-->
<!--[if IE 9]>
  According to the conditional comment this is IE 9<br />
<![endif]-->
<!--[if gte IE 8]>
  According to the conditional comment this is IE 8 or higher<br />
<![endif]-->
<!--[if lt IE 9]>
  According to the conditional comment this is IE lower than 9<br />
<![endif]-->
<!--[if lte IE 7]>
  According to the conditional comment this is IE lower or equal to 7<br />
<![endif]-->
<!--[if gt IE 6]>
  According to the conditional comment this is IE greater than 6<br />
<![endif]-->