`Main`¶

Render the semantic main landmark for the page's primary content.


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

Live demo¶

<main>Main content

Render the semantic `main` landmark for the page's primary content.

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 Heading, Main, Text
component = Main(Heading('Dashboard', level=1), Text('Current workspace activity'))

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

How it works¶

Main emits a native <main>, preserving semantic navigation instead of using a generic div. Children may be passed individually or as one non-string sequence. Landmark helpers are real typed classes with an allowlisted attribute set.

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¶

Main(*nodes, children=None, class_=None, id=None, lang=None, dir=None, role=None, aria=None, data=None, ...)

Parameter	Type	Meaning
`nodes`	`NodeLike`	Positional content belonging to this semantic region.
`children`	`NodeLike \| sequence \| None`	Keyword alternative; combines with positional nodes.
`class_`	`str \| None`	Optional authored class name.
`id`	`str \| None`	Stable fragment or target identifier.
`lang / dir / role / title / tabindex / aria / data / hidden`	`allowlisted`	Safe HTML attributes; hostile roles like `presentation` / `none` are rejected.

Composition and backend behavior¶

Keep Main 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.

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

Accessibility¶

Use one visible main landmark per full page so keyboard and screen-reader users can reach primary content directly.

Security¶

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

Common mistakes¶

Do not put repeated navigation, footers, or modal content inside main.
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

Main¶