method ElementHandle.prototype.contentFrameRe-exportimport { ElementHandle } from "https://deno.land/x/puppeteer@16.2.0/mod.ts"; contentFrame(): Promise<Frame | null>Resolves to the content frame for element handles referencing iframe nodes, or null otherwise Resolves to the content frame for element handles referencing iframe nodes, or null otherwise ReturnsPromise<Frame | null>