> What does that mean, exactly? Do you have any resources you could link to?
Check out the "Thinking in Polymer" talk from Polymer Summit 2015: https://www.youtube.com/watch?v=ZDjiUmx51y8
Specifically talks about "the DOM is your API" at 0:49 --> https://youtu.be/ZDjiUmx51y8?t=50
disclaimer: technical writer for polymer