Gmail Append HTML [Keyboard] is a Chrome extension developed by ndomino. It falls under the category of Browsers and the subcategory of Add-ons & Tools. This extension allows users to use HTML content in Gmail directly from the context menu and through keyboard shortcuts.

The extension is a fork from the original Gmail HTML Email extension by erichlotto, with all credit going to the original developer. The addition of keyboard shortcuts makes the process of pasting HTML content smoother and more efficient. The default keyboard shortcut is 'CTRL+SHIFT+X', which allows users to cut the HTML content (CTRL+X) and immediately paste it as rendered HTML by adding the shift key to the shortcut.

With Gmail Append HTML [Keyboard], users can enhance their Gmail experience by easily inserting HTML content without the need for manual formatting. This extension provides a convenient and efficient solution for users who frequently work with HTML in their Gmail messages.