Type: boolean Default: false

Adds a prominent warning banner to the document indicating that this is a preview and should not be cited or referenced. Used for preview deployments (e.g. pull request previews) to distinguish them from official versions.

var respecConfig = {
  isPreview: true,
};

When prNumber and prUrl are also set, the banner includes a link to the pull request:

var respecConfig = {
  isPreview: true,
  prNumber: 123,
  prUrl: "https://github.com/example/spec/pull/123",
};

• Shows a <details> warning banner — intentionally attention-grabbing
• When prNumber + prUrl are present, the banner identifies which pull request this preview is for
• Useful for PR preview deployments to avoid readers accidentally citing a draft-of-a-draft
• Do not set in production specs