Check out a free preview of the full Responsive HTML Email Design course:
The "CSS3, Interactivity, & Video" Lesson is part of the full, Responsive HTML Email Design course featured in this preview video. Here's what you'd learn in this lesson:

Email clients that support CSS3 open the door to a lot of creativity. Altering border-radius, transforms, transitions, or @keyframe animations can make emails much more engaging. Jason gives a few examples of creative uses of CSS3. He also talks about adding interactivity and HTML5 video.

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