Media stream trust display techniques are described in which trust information regarding content elements is accessible on an individual element basis. In particular, composite content having various content elements is rendered via a user interface of a browser or other application that supports web-based communications. Trust data is then obtained for the content elements on an individual basis in accordance with a trust model implemented by the application that facilitates retrieval of trust assertions for individual content elements. The user interface may be configured to display trust data using separate elements to represent trust data for different content elements. The display of trust data may include previews of content elements, such as thumbnail images and/or live media tiles for media streams. Additionally, a thumbnail view of a composite page/document may be provided that has selectable representations of content elements through which a user may access corresponding trust data.