It's because "standard" Markdown and many other formats already support HTML. If these kind of components were vended as standard web components, they could wor

It's because "standard" Markdown and many other formats already support HTML. If these kind of components were vended as standard web components, they could work in existing Markdown files and workflows. My team is also working on code sample editor and preview components, but as web components for this reason: https://polymerlabs.github.io/playground-elements/ https://polymerlabs.github.io/playground-elements/