Method before

worker-configuration.d.ts:1189–1189

(content: string | ReadableStream | Response, options?: ContentOptions)

    setAttribute(name: string, value: string): Element;
    removeAttribute(name: string): Element;
    before(content: string | ReadableStream | Response, options?: ContentOptions): Element;
    after(content: string | ReadableStream | Response, options?: ContentOptions): Element;
    prepend(content: string | ReadableStream | Response, options?: ContentOptions): Element;
    append(content: string | ReadableStream | Response, options?: ContentOptions): Element;