After attempting to iframe the post editor, the presence of metaframes became an impediment that prevented the editor content from loading in the iframe and rendered these benefits of iframes unavailable: these benefits are important for supporting CSS reuse in the editor and front-end, as well as streamlining block and topic development. Even with the presence of metaframes, community members have been working to introduce them into the post editor, but it took many attempts to determine how to adapt the interface to separate metaframes from post content. Split view is now implemented to support...