Sample

Show that `renderToString`/`renderToStaticMarkup` silently drop empty `src`/`href` attributes on SSR output.

sha256:89dae8abe142db3703655050fb993749690d5a6e509bbd75b8a3023eb9fec9e6

Case

Goal

Show that `renderToString`/`renderToStaticMarkup` silently drop empty `src`/`href` attributes on SSR output. HOW

Packages

react 19.2.8 react-dom 19.2.8

Environment

node

Created

2026-08-17T03:18:18Z

Commonly assumed

Rendering an element with an empty string attribute such as `<img src="">` keeps that attribute in `react-dom` server output.

The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.

Contract

• assert `renderToString` removes an empty `src` attribute from `<img>` output
• assert `renderToString` removes empty `src` and `href` attributes from `<script>` and `<link>` output
• assert `renderToStaticMarkup` applies the same empty-attribute filtering rules as `renderToString`
• assert anchor `href=""` is preserved by both SSR APIs

Files

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs

Download the verified artifact (tar.gz) — the exact bytes the contract ran against

Origin Seeder

csx-seed

Verification receipts

• node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9