Data uri in Confluence page

For a static content macro I’m writing, I’d like to embed a small image as a data uri into the page (i.e. as <img src="data:image/gif;base64,R0lGODlhEAAQAMQAAORHHO ... IQA7" alt="star" width="16" height="16">) .

Is that supported in Confluence Cloud? I’ve done a couple of experiments by embedding the above code, but they were not rendered and just stayed blank.