Function canHavePreamble

packages/react-dom-bindings/src/server/ReactFizzConfigDOM.js:830–832

(formatContext: FormatContext)

}

export function canHavePreamble(formatContext: FormatContext): boolean {
  return formatContext.insertionMode < HTML_MODE;
}

export function createRootFormatContext(namespaceURI?: string): FormatContext {
  const insertionMode =