Before you make the decision to set a date in 2022 to take another look at HTML5, I ask that you read the rest of this article. My goal this month is to give you practical strategies for how you can adopt HTML5 technologies today without ending up with the kind of graceless degradation illustrated in Figure 2. In this article, I’ll cover:

Feature detection versus user agent (UA) sniffing
Polyfilling with JavaScript
Graceful degradation