Note below "steps for determining the web app's chosen display mode" refers to non-existent assertion

[gsnedders]

https://w3c.github.io/manifest/#dfn-steps-for-determining-the-web-app-s-chosen-display-mode

This has a note:

The above loop is guaranteed to return a value before the assertion, due to the fact that browser is in every mode's fallback chain, and the requirement that all user agents support the browser display mode.

Note the above loop doesn't have an assertion following it, thus this note is nonsense.

[marcoscaceres]

Note to editors: To add the assert, one can add "Assert: ..." and ReSpec will do the right thing.