Parcel has first-class support for Microsoft Office code.
Conditional comments have proper syntax highlighting in the editor, visually distinguishing them from regular comments.
For example, the following comment:
<!--[if true]><table role="presentation" width="100%" align="center" style="background:#EEE"><tr><td></td><td style="width:600px;background:#ffffff;padding:24px;"><![endif]-->
Parcel suggests MSO CSS properties as you type. In the editor, start typing
mso- and you'll get access to all available MSO CSS properties. Keep typing until you find the one you want, and then press Enter to auto complete it. You can also navigate the popup suggestions menu with the cursor or arrow keys.