Opening this issue after a discussion with @parlough. He noted that DartPad embeddings (an embedded version of DartPad running in an iframe in another web page) is effective but heavy weight; many such embedding can slow a page down.

@parlough - can you sketch out what you were thinking wrt but a lighter-weight embedding might look like? Just a div, styled dart text, and a 'run' button that called the dartpad backend to compile?