mj-attributes

Inside mj-attributes, a tag citing one MJML component (like mj-text; see example) overrides default settings for listed MJML attributes on the one component.

An mj-all is like the above, but affects all MJML components via the one tag.

mj-class tags create a named group of MJML attributes you can apply to MJML components. To apply them, use mj-class="<name>".

<mjml>
 <mj-head>
   <mj-attributes>
     <mj-text padding="0" />
     <mj-class name="blue" color="blue" />
     <mj-class name="big" font-size="20px" />
     <mj-all font-family="Arial" />
   </mj-attributes>
 </mj-head>
 <mj-body>
   <mj-section>
     <mj-column>
       <mj-text mj-class="blue big">
         Hello World!
       </mj-text>
     </mj-column>
   </mj-section>
 </mj-body>
</mjml>