Personally, I'd love to see HTML add a standard way to refer to the value of JavaScript objects in memory. This is already done (badly in my opinion) with the b

Personally, I'd love to see HTML add a standard way to refer to the value of JavaScript objects in memory. This is already done (badly in my opinion) with the blob:// url you can pass to media elements. Declaratively defining an element with a live JS variable for attributes would be very useful in lots of ways, and not specific to any programming style.