Which package(s) are affected?

SSR (@lit-labs/ssr)

Description

Server rendering a <textarea> with a binding in property/attribute/element position results in a comment node being added inside the textarea content, which is rendered as plain text rather than being parsed as an HTML comment.

Reported by user Levi in Discord thread: https://discord.com/channels/1012791295170859069/1073542653402157076

Reproduction

When server-rendering the following template using @lit-labs/ssr:

renderInput(id: string) {
  return html`<textarea name="${id}"></textarea>`;
}

A comment node shows up inside the textarea:

<textarea id="name"><!--lit-node 0--></textarea>

Workaround

Avoid binding to the textarea node.

Is this a regression?

No or unsure. This never worked, or I haven't tried before.

Affected versions

@lit-labs/ssr 3.0.1

Browser/OS/Node environment

Any