Thank you for reaching out about your email campaign! I can understand how important it is for your document type declarations in custom coded emails. What !DOCTYPE are you trying to use in the Advanced Editor? I apologize at this time our advanced editor does strip this. Being able to include these declarations is a feature request I have tracked in your account as our engineers are collecting feedback on. In the meantime, as a workaround we would suggest replacing the <td> tags with <th> tags. Webkit does allow the "display: block" style on <th> tags with no doctype declared. It’s also important we point out that <th> tags default to "font-weight: bold" and "text-align: center" styles.
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