"Default display mode" section is super confusing

[fantasai]

The concept of "default display mode" is very confusing. Is it the mode requested by the app manifest? The mode the UA would have defaulted to if there is no request from an app manifest? The display mode that is actually in effect at the end of the day?

It would be much easier to follow this section if there were two named concepts neither of which use the word "default":

• requested display mode - the mode requested by app manifest
• effective display mode - the mode actually effective on the document after consideration of the app manifest, user preferences/overrides, and UA constraints

(It also needs to be clarified whether the display-mode media query reflects the effective display mode, requested display mode, or something else.)

[frivoal]

Consider this sentence (at the end of section 7.1):

A user agent MUST reflect the applied display mode of the web application via a CSS media query [MEDIAQ].

If the user has overridden the manifest's display value, which way is the media feature supposed to go? Is this phrase deliberately not using the term "default display mode" to express some conceptual difference? If so, I can't what the difference is because both this sentence and the definition of "default display mode" rely on the term "apply".

Relatedly, the definition of apply itself could use some help too: the definition says what it means to apply a manifest (when it "affects the presentation or behavior of a browsing context"), but it doesn't say what it means to apply a member of a manifest, though it gets used that way. Are all members considered to apply if the manifest as a whole applies, or to they only apply if they individually made some difference? Do they count as not applying if they've been overridden by the user?

[marcoscaceres]

All good points (it's definitely confusing)... will see if we can come up with something better. Appreciate the suggestions and feedback 🙏.