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Chirp 0.3.1

htmx 4.0 alignment, Speculation Rules API, tiered View Transitions, and bug fixes across standalone examples and framework core

Focus: align with htmx 4.0 and the evolving web platform — Speculation Rules, Invoker Commands,<htmx-partial>support — plus a tiered View Transitions system and a batch of bug fixes across examples and core.

Highlights

Speculation Rules API

Auto-generate<script type="speculationrules"> from your route definitions with tiered opt-in via AppConfig(speculation_rules=...):

Value Behavior
False / "off" Inject nothing (default)
True / "conservative" Prefetch linked pages on hover
"moderate" Prefetch eagerly, prerender on hover
"eager" Prerender eagerly (routes must be side-effect-free)

JSON output is XSS-safe with< and &escaping before embedding in the script tag.

Tiered View Transitions

The single booleanview_transitionstoggle is replaced with three tiers:

Value Behavior
False / "off" Inject nothing (new default)
True / "htmx" htmxglobalViewTransitionsonly (baseline, all browsers)
"full" htmx JS + MPA CSS/meta (cross-document, no Firefox yet)

Breaking: the default changed fromTrue to False to prevent crossfade flicker on plain navigations. Apps that had view_transitions=True(or relied on the old default) should set it explicitly.

htmx 4.0 alignment

Three forward-looking features prepare Chirp for the htmx 4.0 ecosystem:

  • <htmx-partial> support — HX-Partial header parsing on Request, fragment block resolution for partial requests, and contract validation for <htmx-partial src="...">elements.
  • Invoker Commands validation —app.check() validates commandfor targets and commandattribute values against the Invoker Commands spec.
  • Speculation Rules injection — See above.

Bug fixes

  • Suspense double-nesting informat_oob_scriptresolved.
  • SSE fragment whitespace stripped from data fields, fixing htmx table row parsing.
  • Markdown filter output marked safe to prevent Kida auto-escaping.
  • Standalone examples — contacts edit URL reset, upload delete route fix, dashboard/hackernews SSE restored, ollama chat UX improvements.
  • Kanban template — replacedloop.index inside {% call %} with CSS :nth-child(odd)for Kida 0.3.0 compatibility.

Changed

  • View Transitions — Tiered system (False / True / "full") replaces single boolean. Default changed from True to False.
  • README — Trimmed redundant sections; added Zoomies to Bengal ecosystem table.

Dependencies

  • kida-templates>=0.3.0(unchanged minimum)
  • bengal-pounce>=0.4.0(unchanged minimum)

Upgrading

uv pip install --upgrade "bengal-chirp>=0.3.1"

pip install --upgrade "bengal-chirp>=0.3.1"

View Transitions migration: If your app relied on the previous default (view_transitions=True), add view_transitions=True (or "htmx") to your AppConfig explicitly. If you used view_transitions=True and want cross-document MPA transitions, switch to view_transitions="full".

To enable Speculation Rules:

app = App(AppConfig(speculation_rules="conservative"))