MJML snippet
Best for assembling a full email from reusable sections.
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Alert Banner
Compact alert callout for account notices, operational updates, and support messages.
- Source
- alert-box.mjml
- MJML and compiled HTML
- 4 client notes
- Snippet or standalone
How to use this block
Treat the component as one production section inside a larger message system. Keep the shared classes and wrapper rules intact, then adapt the copy, imagery, and links to the send.
Use this block when...
- Use near the top of an email when the update is urgent or operationally important.
- Keep the copy concise so the banner feels like a signal, not another body paragraph.
Keep in mind
- Do not rely on colour alone to communicate urgency or severity.
- Ensure the headline describes the alert clearly for screen-reader users.
Copy the format that fits the job
Copy the MJML snippet into the same body as your other blocks. Use standalone mode when testing this block on its own or exporting a full file for QA.
Standalone MJML
Best for local testing or isolated compilation.
Compiled HTML
Best for ESP handoff, QA review, or HTML-only integrations.
Compatibility and rendering notes
Use these notes before moving the block into a campaign, layout system, or client handoff.
Client-specific notes
- Gmail (Web + Mobile): Primary structure, spacing, and CTA rendering hold up in Gmail web and mobile views.
- Outlook Desktop (Windows): Border accent and icon alignment can vary slightly in legacy Outlook rendering.
| Client | Status | Notes |
|---|---|---|
| Gmail (Web + Mobile) | Tested | Primary structure, spacing, and CTA rendering hold up in Gmail web and mobile views. |
| Outlook Desktop (Windows) | Partial | Border accent and icon alignment can vary slightly in legacy Outlook rendering. |
| Apple Mail (macOS + iOS) | Tested | No additional notes. |
| Yahoo Mail | Tested | No additional notes. |
Source panels
The panels below preserve the copy behaviour for MJML and compiled HTML. Template Hedgehog Pro includes the full offline archive for teams that need the complete system locally.
Snippet assembly: place this block inside the same <mj-body> as your other snippets, then stack sections in send order.
Editable source
MJML snippet
Component block only. Use this when assembling an email from multiple reusable sections inside a project that already includes the shared MJML classes.
Formatting code preview...Compiled output
Compiled HTML snippet
Component-only compiled markup for block-level inspection and HTML assembly workflows.
Formatting code preview...Related production context
Use these references to see how the block fits into larger message systems.
Pairs well with
Order Status Update
Three-step fulfilment tracker for shipping progress, service milestones, and order-state updates.
Security Alert Card
Operational security alert for unfamiliar sign-ins, device changes, and account activity warnings.
Account Verification CTA
Account verification block for sign-up flows and email validation messages.