Used to be I couldn't embed a Tagul cloud on my Canvas course site, which is https. My workaround was to create an HTML file with nothing but the cloud embed code, place it in a public Dropbox folder and then embed the html file on the Canvas site with an iframe tag naming the https Dropbox address as the source. The problem now is that I can't get a Tagul cloud to show up in the file hosted on Dropbox, neither with the standard code nor with the Flash code mentioned by Alex. The Flash code embedded directly on the Canvas site also doesn't work, even though it doesn't get stripped.