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ERROR TYPE Target

Email Not Displaying Correctly in Gmail: Fix Outlook Background Image Collapse for Mailchimp for WCAG Accessibility Violations

Accessibility failures prevent screen readers from navigating templates, isolating disabled subscribers and increasing unsubscribe rates. Below is the targeted integration guide to fix Outlook Background Image Collapse inside Gmail App (iOS & Android) templates when using Mailchimp.

Technical Breakdown

Gmail App (iOS & Android) uses the WebKit / Blink which lacks support for standard rendering rules. This causes Outlook Background Image Collapse elements to break or collapse when rendering templates.

Mailchimp Behaviors

Mailchimp's classic template compiler injects custom inline attributes (like 'mc:edit') and automatic CSS reset sheets before delivery. If your fallback code includes head styling wrappers, Mailchimp's post-processing parser will strip media query priorities, breaking display rules in clients like iOS Mail and Gmail. The fallback table structures must have absolute styles inlined directly. Inject correct table roles (role='presentation') and keep color pairings above the WCAG AA contrast threshold of 4.5:1.

Remediation Code Block

To resolve this in Outlook desktop, you must wrap your element or cell inside a Microsoft VML (Vector Markup Language) shapes structure that declares the background image explicitly using the 'v:background' or 'v:fill' vector properties. In your Mailchimp campaign manager, make sure you configure your links to run via *|UNSUB|*.

<td background="https://example.com/bg.jpg" bgcolor="#222222" valign="top" style="background-image: url('https://example.com/bg.jpg'); background-repeat: no-repeat; background-size: cover;">
  <!--[if mso]>
  <v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true" stroke="false" style="width:600px;height:300px;">
    <v:fill type="tile" src="https://example.com/bg.jpg" color="#222222" />
    <v:textbox inset="0,0,0,0">
  <![endif]-->
  <div>Overlay Content</div>
  <!--[if mso]>
    </v:textbox>
  </v:rect>
  <![endif]-->
</td>

Live Code Sandbox Test

Interactive Mailchimp Custom Sandbox

Target Environment: Gmail App (iOS & Android)

How to Deploy inside Mailchimp

1

Copy the fixed VML or table wrapper code block from the remediation box above.

2

Locate your campaign block inside Mailchimp. Drag a 'Code' block into your canvas workspace. Toggle the editor view to Source, paste the optimized code, and click Save.

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