How can I enable hidden emoticons in Gmail

EMBED MODE

Full book
Displays a full, readable book. Please note that in smaller sizes the book will be hard to read. The minimum recommended width is 540px.

Thumbnail
Display the title, cover image and author. Clicking will open the full book on Ourboox.

Copy the following code to embed this book in another book or on another site:

PREVIEW

How can I enable hidden emoticons in Gmail Mark John