Sphero Mini Hardware
Overall compatibility: 94/100 across 21 email clients · 20 of 21 clients passing (4 clean at 100%) · 207 compatibility warnings (0 error-level) · 32.9KB compiled HTML.
Attribution · MJML Open Source
Template adapted from the official
MJML email-templates repository
under the MIT License (© Mailjet / Sinch). Raw .mjml source code is included.
Client Compatibility
Score: 94/100 · 20/21 passing
Notes on this template
It opens: "Colorful, interchangeable shells allow you to switch one out to suit your mood. Remove the shell to charge. GET YOUR ROBOT Sphero Mini fits a huge experience into a tiny robot the size of a ping pong ball. It’s fun,...". 9 images, 34 Outlook-only blocks, no dark-mode query, system fonts.
The spread is what matters on this template: 100 in Superhuman against 55 in Outlook Classic, a 45-point gap across the same file. 4 of the 21 clients render it without a single flagged property. Outlook Classic is the one to preview against after any edit, because it is where this template has the least margin, and the 207 warnings behind that score are concentrated there rather than spread evenly.
At 32.9KB compiled it has roughly 69KB of headroom before Gmail clips the message at 102KB and hides the rest behind a "View entire message" link. Inlined CSS and base64 images both count toward that, so watch it as you add sections.
Safe to customise: Body copy, screenshots and the changelog list. Product mail is usually the longest thing a team sends, which makes the size figure below the one to watch as you add sections.
Leave alone: The heading hierarchy. It carries the document outline that screen readers announce, and flattening every heading to styled text is the most common accessibility regression in this category.
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