When pulling html from a database into the editor it alters the html.
For example:
<table>
<tr>
<td style="width:100px;background-color:#FF0000;">Test</td>
</tr>
</table>
Is modified to..
<table class="k-table"><tbody><tr><td><p>Test</p></td></tr></tbody></table>
Losing the style attributes and adding classes and paragraph tags breaking our current formatting requirements.
Ideally we would just modify our html data to fit the new formatting but with years of data that's just not feasible.