`Container`¶

Constrain and center a readable block of page content.


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

Live demo¶

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This readable block stays centered with a bounded width.

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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 Container, Heading, Text

component = Container(Heading('Profile', level=1), Text('Manage your public details.'), id='profile')

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

How it works¶

The component emits an addressable div and always retains the hedron-container theme hook. Positional nodes and children= use the same normalization rules, and an application class augments rather than disables the built-in layout. Width, gutters, and breakpoints remain theme CSS concerns.

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¶

Container(*nodes, children=None, id=None, class_=None)

Parameter	Type	Meaning
`nodes`	`NodeLike`	Positional content inside the width constraint.
`children`	`NodeLike \| sequence \| None`	Keyword alternative for generated or declarative child lists; combines with positional nodes.
`id`	`str \| None`	Stable DOM target for links, tests, and HTMX swaps.
`class_`	`str \| None`	Application class appended after `hedron-container`; the built-in theme hook is retained.

Composition and backend behavior¶

Keep Container 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.

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

Accessibility¶

A container has no semantics of its own, so keep headings and landmarks inside it.

Security¶

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

Common mistakes¶

Do not use Container as a substitute for Main or Section.
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

Container¶