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When flushing the shell, stylesheets with precedence are emitted in the `<head>` which blocks paint regardless. Outlining a boundary solely because it has suspensey CSS provides no benefit during the shell flush and causes a higher-level fallback to be shown unnecessarily (e.g. "Middle Fallback" instead of "Inner Fallback"). This change passes a flushingInShell flag to hasSuspenseyContent so the host config can skip stylesheet-only suspensey content when flushing the shell. Suspensey images (used for ViewTransition animation reveals) still trigger outlining during the shell since their motivation is different. When flushing streamed completions the behavior is unchanged — suspensey CSS still causes outlining so the parent content can display sooner while the stylesheet loads.
react-markup
This package provides the ability to render standalone HTML from Server Components for use in embedded contexts such as e-mails and RSS/Atom feeds. It cannot use Client Components and does not hydrate. It is intended to be paired with the generic React package, which is shipped as react to npm.
Installation
npm install react react-markup
Usage
import { experimental_renderToHTML as renderToHTML } from 'react-markup';
import EmailTemplate from './my-email-template-component.js'
async function action(email, name) {
"use server";
// ... in your server, e.g. a Server Action...
const htmlString = await renderToHTML(<EmailTemplate name={name} />);
// ... send e-mail using some e-mail provider
await sendEmail({ to: email, contentType: 'text/html', body: htmlString });
}
Note that this is an async function that needs to be awaited - unlike the legacy renderToString in react-dom.
API
react-markup
See https://react.dev/reference/react-markup
Thanks
The React team thanks Nikolai Mavrenkov for donating the react-markup package name.