`StyleScope`¶

Bound a subtree to theme, finite variant, color mode, and density markers only.


Import	`from hedron import StyleScope`
Distribution	`hedron`
Backend activity	No
Normal render mode	`RenderMode.FRAGMENT`

Live demo¶

Scoped panel

Theme, color mode, and density markers only.

The preview is a local docs simulation (not a running Hedron server). Interactive demos show a “Simulated HTMX” trace when applicable.

Basic use¶

from hedron import StyleScope, Text
component = StyleScope(Text('Scoped panel'), theme='aurora', variant='dense', color_mode='dark', density='compact')

Compose under Page for full documents, or return from a fragment route for HTMX swaps.

How it works¶

StyleScope is a visible boundary for theme, finite variant, color mode, density, and presentation mappings. Use presentation={'PageHeader.title': 'display', 'Heading': 'section-heading'} to provide nearest-scope recipe defaults; explicit component settings remain authoritative.

This component's core behavior is server-rendered HTML and does not require a browser runtime. The preview is ordinary semantic HTML, so keyboard, form, link, and disclosure behavior comes from the platform.

Constructor and parameters¶

StyleScope(*nodes, *, theme=None, color_mode=None, density=None, variant=None, presentation=None, recipes=(), id=None, class_=None, mark=None)

Parameter	Type	Meaning
`nodes`	`NodeLike`	StyleScope body content.
`theme`	`str \| None`	Optional registered theme name emitted as `data-hedron-theme`.
`variant`	`str \| None`	Optional finite registered variant emitted as `data-hedron-variant`. Unknown names fail closed.
`color_mode`	`light \| dark \| None`	Optional color-mode marker (`data-hedron-color-mode`).
`density`	`compact \| comfortable \| spacious \| None`	Optional density marker (`data-hedron-density`).
`presentation`	`dict[str, str] \| None`	Finite slot-to-recipe defaults inherited by descendants.
`recipes`	`Sequence[StyleRecipe]`	Optional scoped recipe catalog used to resolve presentation names into bounded component markers.

Composition and backend behavior¶

Keep StyleScope at the smallest semantic boundary. Fragment routes should return only the replaced region and preserve stable target IDs across success, validation, empty, loading, and error responses.

StyleScope is primarily presentational; keep any mutation on an explicit action or component route.

Accessibility¶

Prefer StyleScope when a region must override theme, finite variant, color mode, or density without application CSS.

Security¶

Escaping and SafeUrl / TrustedHtml are framework concerns; authorization and data exposure remain application code. Redact secrets before rendering.

Common mistakes¶

Do not pass arbitrary CSS or unresolved selectors; use finite StyleRecipe values and documented presentation slots.
Do not copy docs-preview JavaScript into an application server.

Testing¶

from hedron import RenderMode, render

result = render(component, mode=RenderMode.FRAGMENT)
assert result.html
assert not result.diagnostics

All component demos · Built-in API · Testing

StyleScope¶