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Framework-agnostic reference for HTML email client quirks — Outlook rendering, dark mode, Gmail clipping, image blocking, preheader text, width constraints, font fallbacks. Use whenever authoring, debugging, or reviewing any HTML email regardless of framework.
默认使用会先检查来源的 Prompt；你也可以切换为直接命令，或下载本地副本。
决定是否安装前，请先阅读 SKILL.md，以及 SkillsMP 当前展示的配套文件。
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
直接命令不会经过审查 Prompt；运行前请先检查来源。
npx skills add https://github.com/danielrosehill/Claude-HTML-Email-Designer-Plugin --skill email-client-gotchas命令会保持在同一行。复制前请横向滚动并检查完整内容。
想先保存到本地？可下载 SkillsMP 当前能够提供的文件。
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基于 SOC 职业分类
| name | email-client-gotchas |
| description | Framework-agnostic reference for HTML email client quirks — Outlook rendering, dark mode, Gmail clipping, image blocking, preheader text, width constraints, font fallbacks. Use whenever authoring, debugging, or reviewing any HTML email regardless of framework. |
HTML email is ~2005-era HTML. Unlike the web, there is no consistent rendering target. These quirks apply regardless of whether you use Foundation, Maizzle, MJML, or raw tables.
<table> — not divs, not flex, not grid. Frameworks hide this but the output is always tables.The most fragile target. Uses Word's rendering engine (not a browser).
<p> or <div> — use table cell padding or spacer rows instead.<!--[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://.../bg.jpg" color="#000000" />
<v:textbox inset="0,0,0,0"><div>
<![endif]-->
<!-- content -->
<!--[if mso]></div></v:textbox></v:rect><![endif]-->
mso-line-height-rule: exactly to avoid extra spacing.<style> from the <head> on some clients (mobile) — always inline critical CSS.class attributes in some paths — rely on inlined styles, not classes.<meta name="color-scheme" content="light dark">
<meta name="supported-color-schemes" content="light dark">
@media (prefers-color-scheme: dark) blocks.<meta name="format-detection" content="telephone=no">.Three approaches, pick one:
@media (prefers-color-scheme: dark) with dark-specific styles. Works in Apple Mail, Outlook.com, some others; ignored elsewhere (which falls back to #1).Arial, Helvetica, sans-serif / Georgia, 'Times New Roman', serif.<link> in <head> and @import — works in Apple Mail, iOS, some Android. Outlook ignores, falls back. Always specify a fallback.alt — 40%+ of users have images blocked by default.width and height as HTML attributes (not just CSS).src — relative paths won't work once sent.The snippet of text shown next to the subject line in the inbox. Set it explicitly:
<div style="display:none;font-size:1px;color:#ffffff;line-height:1px;max-height:0px;max-width:0px;opacity:0;overflow:hidden;mso-hide:all;">
Your preheader text here — keep under 90 chars
</div>
Without this, clients grab the first visible text, which is usually "View this email in your browser" — wasted real estate.
href="https://..." (not href="/page").text-decoration: none, so design for underlined links.target="_blank" guaranteed — clients ignore it.<form>, no <input>, no <button> submit behavior — stripped or inert.lang="en" on <html>.role="presentation" on layout tables: <table role="presentation" ...>.<h1> → <h2> etc.).alt + explicit width/height