Definition
Outlook uses Word for its rendering engine, so it needs bespoke markup. Conditional comments hide or reveal tables to each client.
Best Practices
- Use conditional comment blocks for Outlook-specific tables.
- Keep the Outlook and modern-client versions visually aligned.
- Comment the intent so maintainers understand why both tables exist.
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Frequently Asked Questions
HTML comments Outlook reads to include or exclude markup, e.g. version tests.
No, they treat them as comments and ignore them.
They add code, so document them and test after editing.