title: Is calc() supported in html email?
body: <p><a href="http://caniuse.com/#feat=calc" rel="noreferrer">caniuse.com</a> shows <code>calc()</code> can be used today in all modern browsers except Opera. But how good is the support for <code>calc()</code> in email clients?
  <br><br>
  Please provide a link to blogs or guides which talk about this.</p>
  
  <p><strong>EDIT</strong><br>
  I am referring to the CSS <code>calc()</code> function</p>