How do Outlook rendering quirks affect design?

Outlook for Windows uses Microsoft Word's rendering engine for HTML emails-not a browser engine. This creates unique constraints: no support for many CSS properties, inconsistent padding/margin handling, and behaviors that differ from every other email client.

Major Outlook quirks: No CSS background images (requires VML workarounds). No max-width (fixed widths required). Limited margin/padding control. Different box model interpretation. Line-height inconsistencies. Image scaling issues. No border-radius on containers. Conditional code requirements (

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