Install Gmail Tables from Chrome Web Store.
How to get started is explained in here.
Tables for Gmail
Tables for Gmail: FAQ (Frequently Asked Questions)
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Video: How to insert HTML tables into emails
The video showcases the Gmail Tables Chrome extension.
Video: How to transform design and improve your Chrome new tab
The video showcases the “Good Morning” extension for Chrome, which transforms the default tab into a dashboard with inspirational quotes, photos, local weather, and easy access to Chrome Apps, bookmarks, and free Gmail productivity apps.