MSO Conditional Comments — VS Code Extension

IntelliSense for MSO (Outlook) conditional comments in HTML email — hover translations, completions, and inline diagnostics.

Features

Hover over any MSO conditional comment to see a plain-English translation of its condition.

<!--[if gte mso 14]>

Hovering shows: MSO Conditional — Visible to: Outlook 2010 and later (MSO ≥ 14)

Errors and warnings appear directly in the editor without requiring an ESLint setup:

Diagnostic	Severity	Example
Invalid condition syntax	Error	`<!--[if mos 16]>` — typo in keyword
Unknown operator	Error	`<!--[if newer mso 16]>` — `newer` is not valid
Unknown version	Error	`<!--[if gte mso 13]>` — version 13 does not exist
Opener without closer	Warning	`<!--[if mso]>` with no matching `<![endif]-->`
Closer without opener	Warning	`<![endif]-->` with no preceding opener

Type <!--[if or <![if to trigger snippet completions for the most common MSO conditional patterns:

Trigger	Description
`mso-all`	Target all Outlook versions
`mso-gte`	Target Outlook greater than or equal to a version
`mso-not`	Hide from all Outlook versions
`mso-hidden-start`	Downlevel-hidden block — hidden from Outlook
`mso-hidden-end`	Close a downlevel-hidden block

HTML, AMP, SSJS, AMPscript, and Handlebars files (any file VS Code identifies as html, ampscript, sfmc, ssjs, or handlebars).

Setting	Type	Default	Description
`msoConditionals.diagnostics.enable`	boolean	`true`	Show inline errors and warnings. Disable if you prefer diagnostics from `eslint-plugin-mso-conditionals` instead.

eslint-plugin-mso-conditionals — get the same validation in CI or in editors without this extension.
mso-conditional-parser — the underlying parser, usable as a standalone npm package.

MIT