I would like to find a tool to convert old static HTML documents with things such as
<table border="1" cellspacing="0" cellpadding="0">
<td width="284" valign="top">
<font color="#0000FF">
(and other similar) to HTML5-compliant format where those attributes must be set by CSS.
The main goal is to remove usage of obsolete features and replace them with appropriate alternative.
Inline CSS would suffice. For example,
<font color="#0000FF">
should be replaced with <span style="color:#0000FF">
Also I don't care about platform, even online service would suit.