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ERROR TYPE Target

Fix Custom Font Fallback Overrides in Mozilla Thunderbird — Klaviyo Guide 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 Custom Font Fallback Overrides inside Mozilla Thunderbird templates when using Klaviyo.

Technical Breakdown

Mozilla Thunderbird uses the Gecko which lacks support for standard rendering rules. This causes Custom Font Fallback Overrides elements to break or collapse when rendering templates.

Klaviyo Behaviors

Klaviyo's drag-and-drop template parser automatically wraps all user-defined block sections in proprietary 'kl-part' class selectors. When rendering templates inside Microsoft Word engines (Outlook 2007-2021), Klaviyo's nested flex fallback blocks can cause structural tables to collapse or shift columns. You must use explicit table widths to override Klaviyo's styling wraps. Inject correct table roles (role='presentation') and keep color pairings above the WCAG AA contrast threshold of 4.5:1.

Remediation Code Block

To prevent Outlook's Times New Roman fallback override, wrap your custom font declarations inside an @media block that Outlook ignores, or use MSO conditional statements to override font-families specifically for Microsoft Word rendering engines. In your Klaviyo campaign manager, make sure you configure your links to run via {% unsubscribe %}.

<!--[if mso]>
<style type="text/css">
  body, table, td { font-family: Arial, sans-serif !important; }
</style>
<![endif]-->
<style>
  @import url('https://fonts.googleapis.com/css2?family=Montserrat&display=swap');
</style>

Live Code Sandbox Test

Interactive Klaviyo Custom Sandbox

Target Environment: Mozilla Thunderbird

How to Deploy inside Klaviyo

1

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

2

Open your Klaviyo template editor. Drag an 'HTML' block directly into your layout timeline (do not use a standard text box). Clear the default skeleton content inside the Klaviyo markup editor and paste the RenderOps corrected inline code.

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