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html-email

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Send-ready single-file email

Anthropic/claude-design/skills/html-email/SKILL.md

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# HTML email

Design an HTML email as ONE self-contained .html file that survives
real email clients. Email rendering is not browser rendering — Gmail,
Outlook, and Apple Mail each strip or mangle different things, and the
rules below are what reliably survives all three. When a rule here
conflicts with normal web-design instincts, the rule wins.

Layout and styling:
- Structure with nested `<table role="presentation" cellpadding="0"
  cellspacing="0" border="0">` — no flexbox, no grid, no floats, no
  position. One centered wrapper table, max-width 600px, single-column
  flow (stacked rows beat side-by-side columns).
- Inline EVERY style on the element it styles. A `<style>` block in
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