### Properties to avoid

Property | Where
--- | ---
`position` | (Outlook, Gmail, Yahoo)
`display` | (Outlook, Gmail)
`float` | (Outlook)
`height` | (Outlook)
`width` in p/div | (Outlook)
`padding` in p/div | (Outlook)
`background` | (Outlook, Gmail)
`min-width` | (Outlook)
`max-width` | (Outlook)
`opacity` | (Outlook, Gmail, Yahoo)
`box-shadow` | (Outlook, Gmail, Yahoo)
`rgba()` | (Outlook)
`data-uri` | (all webmail)

### Selectors to avoid

`E[attr]` | (Outlook, Gmail)
`E:nth-child(n)` | (Outlook, Gmail)
`::before` and `::after` | (Outlook, Yahoo, Gmail)
`E F` | (Gmail)
`E + F`, `E > F` etc | (Outlook, Gmail)

Inline your CSS as much as possible.

### Basic layout

    <table cellpadding="0" cellspacing="0" role="presentation">
      <tr>
        <td width="auto"></td>
        <td width="600" background="#ffffff">
          ···
        </td>
        <td width="auto"></td>
      </tr>
    </table>

### Responsive

    <style>
    @media only screen and (max-device-width: 480px)
    </style>

`<style>` is supported in the head and body by everything except Gmail. Only use them for responsive styles.

## References

- CSS support matrix campaignmonitor.com

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