Embedding a Google document via the onebox gem seems to be broken. All that displays is a blank placeholder. When trying new posts, I get the following error in the console:
Load denied by X-Frame-Options: (Google Doc URL) does not permit cross-origin framing.
I’ll paste the URL of a sample document, https://docs.google.com/document/d/1IQGdx-1X-E_W3O5PSiV9RF1hhjI5hryWZF9FFYNv4Oc/edit?usp=sharing, in a line by itself here: