A new class for containing value objects: it is somewhat similar to Struct (and reuses some of the implementation internally), but is intended to be immutable, and have more modern and cleaner API.

This approach also splits email development for modern email clients and older clients in two. You can use Safari/Chrome to test and develop modern techniques for WebKit-supported clients while using Firefox for your baseline experience for older clients like Outlook.

This media query only targets WebKit-supported email clients—which have incredible support for HTML5 and CSS3. This media query allows you to use of modern techniques like HTML5 video, CSS3 animation, web fonts, and more.

Although a lot of email development is stuck in the past, that doesn’t mean we can’t modernize our campaigns right along with our websites. Many of these tips can be baked right into your email boilerplate or code snippets, allowing you to create more accessible HTML emails without too much thought.