title: VSCode throws errors for all mso properties...?
body: <p>I'm writing an html email based on a template I didn't create. It has a lot of <code>mso</code> css tags like this: <code>mso-hide: all;</code> </p>
  
  <p>I understand what these tags are for, but they make VSCode throw errors like this:</p>
  
  <p><code>[css.lint.unknownProperties] Unknown property: 'mso-table-rspace' [unknownProperties](252, 13)</code></p>
  
  <p>It's driving me up a wall. I tried installing some CSS extensions in hopes to eliminate the errors, but haven't found one that helps yet.</p>
  
  <p>How can I make these <code>mso</code> properties go from Unknown to "known" in VSCode?</p>