Meta tags

niso-platform-style

<meta name="niso-platform-style" content="auto">

Gives the page the platform’s base style and its --niso-* tokens, in a niso-platform cascade layer where the meta is in the head.

content	Sheet
auto	the platform niso is built for: ios when built for iOS and iPadOS, android for Android, and web everywhere else, including macOS, tvOS, visionOS, watchOS, Linux and headless
ios, android, web	that platform’s sheet, wherever the page runs
off	none

Only the first such meta in the head counts. Changing its content, or removing it, swaps or removes the sheet live. The code is crates/niso-core/src/prelude.rs; the sheets are in crates/niso-core/ua/. See Platform style.

viewport-fit=cover

<meta name="viewport" content="width=device-width, viewport-fit=cover">

By default a page sits inside the safe area. With viewport-fit=cover in the last viewport meta of the head, it’s laid out under the status bar, the cutouts and the home indicator, and keeps its content clear of them with the --niso-safe-* tokens (env(safe-area-inset-*) is always 0 in niso’s style engine).

Other viewport keys, including interactive-widget, aren’t read.