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fix(eclipse): keep accordion content in the server-rendered HTML - #8314

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@gregory-boch-prisma gregory-boch-prisma commented Sep 23, 2026

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Closed accordion panels are unmounted, so an FAQ built with <Accordions> ships its questions as markup and its answers only as escaped RSC flight data inside a <script> tag.

Evidence

Measured against the live site, https://www.prisma.io/blog/agents-md-for-databases:

In the rendered DOM Inside <script> (RSC payload)
FAQ questions yes yes
FAQ answer bodies no yes, escaped JSON

Every question appears as real markup. Not one answer body does.

Why it matters

Crawlers that do not execute JavaScript, which is most AI crawlers, see the questions and none of the answers. FAQ blocks are the most quotable part of a post: short, self-contained, already in question-and-answer shape. They are also where the content-seo-geo skill directs authors to put citable claims.

<Accordions> is used by 57 blog posts and the docs.

The change

forceMount keeps the panel in the DOM. A closed panel collapses to h-0 and stays clipped by the existing overflow-hidden, so what a reader sees should be unchanged; only what is in the DOM changes.

Not verified locally

I could not build or run this. There is no Node or pnpm on the machine it was written on, so the Eclipse and Docs Playwright suites and a visual check are down to CI and a reviewer. The specific thing to confirm by eye: that a closed panel still collapses cleanly and the open and close animations are unaffected.

Follow-up, not in this PR

A FAQPage JSON-LD block emitted per post would put the same Q&A in the page as structured data and not depend on this component at all. Worth doing regardless of this fix.

🤖 Generated with Claude Code

Summary by CodeRabbit

  • Bug Fixes
    • Closed accordion panels remain mounted and collapse to zero height, preserving open and close animations.
    • Closed panels are inert, keeping their content out of keyboard navigation and the accessibility tree while closed.
    • Panel heights adjust to their natural content size, including when that content changes.
  • New Features
    • Accordions support controlled values, allowing the open panel state to be managed externally.

Radix unmounts closed accordion content, so an FAQ built with <Accordions>
ships its questions as markup and its answers only as escaped RSC flight
data inside a script tag. Verified against the live blog: on
/blog/agents-md-for-databases every question appears in the DOM and not one
answer body does.

That hides the most quotable part of a post from crawlers that do not run
JavaScript, which is most AI crawlers. 57 blog posts and the docs use this
component.

forceMount keeps the panel in the DOM; a closed panel collapses to height 0
and stays clipped by overflow-hidden, so the rendered result is unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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  • packages/eclipse/src/components/accordion.tsx
  • packages/eclipse/src/components/ui/accordion.tsx
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Walkthrough

AccordionContent stays mounted when closed and uses a measured height for animation. The accordion root provides open item values through context. Each item marks its content inert when it is closed. Tests verify the rendered content, inert state, and closed-state height.

Changes

Accordion content behavior

Layer / File(s) Summary
Track open values and set collapsed content inert
packages/eclipse/src/components/accordion.tsx
The root uses the controlled value when provided, otherwise its internal state. It provides the effective open values through context and calls onValueChange when the root value changes. Each item sets its content to inert when closed.
Keep closed content mounted and animate its height
packages/eclipse/src/components/ui/accordion.tsx, packages/eclipse/test/accordion.test.tsx
AccordionContent stays mounted when closed. A ResizeObserver measures its inner content and supplies the height to Radix’s animation variable. Closed content has zero height. Tests check static markup, inert state, and the zero-height variable.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 9b64d

Closed answers remain in the rendered HTML while panels stay collapsed. No issue identified here requires a fix before normal CI and visual checks.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

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Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 3 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and concisely describes the main change: keeping accordion content in server-rendered HTML.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@packages/eclipse/src/components/ui/accordion.tsx`:
- Line 82: Update AccordionContent to apply inert while the panel is closed and
remove it when open, using its open-state information. Preserve forceMount so
answer text remains in server-rendered HTML while closed controls are excluded
from keyboard navigation.

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Comment thread packages/eclipse/src/components/ui/accordion.tsx
Follow-up to the forceMount change. Because forceMount suppresses Radix's
normal closed `hidden` state, h-0 and overflow-hidden only clip the panel
visually: links and buttons inside a closed answer stayed focusable and in
the accessibility tree.

Accordions now publishes its open values on a context, and Accordion marks
its content inert while collapsed. inert removes the subtree from the tab
order and the accessibility tree without removing it from the DOM, so the
answer text is still in the server-rendered HTML, which was the point of
the original change.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
@gregory-boch-prisma

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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@packages/eclipse/src/components/accordion.tsx`:
- Line 72: Update the Accordions component so openValues reflects the effective
controlled value passed to Primitive.Root, rather than only local state
initialized from defaultValue. Compose onValueChange to update local state and
invoke the controlled handler, keeping AccordionContent inertness aligned with
the panels actually open.

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Accordions accepts Radix's controlled value and onValueChange, and the
{...props} spread put a caller's value onto Root while the inert context
still read local state. A controlled root could therefore render a panel
open with its content inert, or leave a closed panel interactive.

value and onValueChange are now destructured out of props, so the spread
cannot reach past them. The root and the context both read the effective
value, and onValueChange is composed so local state and the caller's
handler both see the change.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
With forceMount, Radix measures the content node in a layout effect while
the closed panel is collapsed to h-0, so its reading is 0 and no re-render
follows: the open animation played from 0 to auto, which snaps at the
halfway point instead of sliding. On page load the closed panel also
animated from its full height to 0 before hydration, flashing every
answer open for a frame or two, because the height variable was unset
and the accordion-up keyframe falls back to auto.

Measure an inner wrapper with a ResizeObserver instead and feed the
result to --radix-accordion-content-height, the variable the keyframes
read. It is 0px in the server render so a closed panel starts collapsed.

Add a server-render test for the behaviour the PR introduces: answers in
the markup of a closed panel, inert on closed and not on open, and the
variable present so nothing animates on load.
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prisma-robot Bot commented Sep 23, 2026

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Reviewed 173dc07 (and rebased on 44ffe83, which landed while I was in it). The server-rendering goal holds: on /components/accordion the answer text is inside the role="region" div in the raw HTML and the closed panel carries inert. Two animation regressions, both measured in headless Chromium against the eclipse app, with main as the baseline:

1. Open snapped instead of sliding. On main the panel grows 0→64px over ~180ms. On this head it sits at 0px for ~70ms and jumps to 64px, every time. Cause: Radix sizes the animation from a getBoundingClientRect() of the content node in a layout effect. With forceMount that measurement now runs while the panel is closed and collapsed to h-0, so it reads 0, and because forceMount keeps Radix's isPresent state constant, the setIsPresent that used to trigger the re-render carrying the height is a no-op. --radix-accordion-content-height stays unset, the accordion-down keyframe falls back to height: auto, and 0→auto is a discrete animation.

2. Closed panels flashed open on page load. Before hydration the closed panel was at 64px for ~200ms, then collapsed. Same root cause from the other side: data-[state=closed]:animate-accordion-up plays from the (unset → auto) variable down to 0. On main this never showed because closed content was display: none.

3. No test. The package has a renderToStaticMarkup suite (test/codeblock.test.tsx) and this change is exactly the kind it exists for.

What I changed (9b64dae):

  • ui/accordion.tsx: AccordionContent wraps children in a measured inner div and feeds its height, via a ResizeObserver, to --radix-accordion-content-height — the variable the keyframes read. The inner div keeps its natural height however the panel is clipped, so the reading is right whether the panel is open or closed, and it tracks content that resizes later (images loading). It is 0px in the server render, so a closed panel starts collapsed.
  • test/accordion.test.tsx: answers present in the markup of a closed panel and not hidden; inert on a closed panel and absent on an open one; the height variable present so nothing animates on load. The third test fails on 173dc07 and passes now.

After the fix the probe matches main: load series flat at 0, open 0→64 in ~187ms, close 64→0 in ~193ms, both repeatable. tsc, oxlint, oxfmt, and the eclipse tests are green.

I will re-read the new head cold in a few minutes.

— reviewer

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prisma-robot Bot commented Sep 23, 2026

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Review clean at 9b64dae

Cold read of the current head, my own fix included. The PR keeps closed <Accordions> panels mounted (forceMount + data-[state=closed]:h-0) so FAQ answers are in the server-rendered HTML for crawlers that do not run JavaScript, marks a closed panel inert so its links stay out of the tab order and the accessibility tree, honours a caller-controlled value for both the root and the inert context, and sizes the open/close animations from a ResizeObserver on the content rather than Radix's closed-state measurement. Three renderToStaticMarkup tests cover the answers-in-markup, inert, and no-load-flash contracts.

Verified on this head:

  • tsc, oxfmt, oxlint (only pre-existing unused-import warnings in unrelated files), eclipse node tests 9/9. The load-flash test fails on 44ffe83 and passes here, so it guards the regression it names.
  • Headless Chromium against apps/eclipse /components/accordion built from this head: answer text inside role="region" in the raw HTML, closed panel inert, load series flat at 0px over the first 1.5 s, open 0→64px across 13 frames in ~190 ms, close 64→0 in ~195 ms, both repeatable. That matches the main baseline I measured in the first round.
  • CI is green on the head, including both Playwright suites (Docs, Eclipse). main has moved by two docs-only commits that touch nothing under packages/eclipse, apps/eclipse or packages/ui.

Risk: low. The change is confined to the eclipse accordion, the behaviour that could regress (animations, SSR markup, keyboard focus) is either measured or under test, and nothing outside the package changed. One thing worth knowing rather than fixing: a panel open by default is at 0px for the ~200 ms animation before hydration, where main was at 0px for ~100 ms (a discrete 0→auto flip); after hydration Radix suppresses the mount animation as before.

Proposed a follow-up builder task for a human to approve: apps/site/src/components/ui/accordion.tsx is a separate shadcn copy without forceMount, so the marketing site's FAQ answers (faq-section.tsx, sections/faq.tsx) have the same server-rendering gap this PR closes for blog and docs. The FAQPage JSON-LD idea from the description is left as the author's note; it is a product call.

— reviewer

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