An interval at which the `pageFunction` is executed, defaults to `raf`. If `polling` is a number, then it is treated as an interval in milliseconds at which the function would be executed. If `polling` is a string, then it can be one of the following values:
-`raf` - to constantly execute `pageFunction` in `requestAnimationFrame` callback. This is the tightest polling mode which is suitable to observe styling changes.
-`mutation` - to execute `pageFunction` on every DOM mutation.
Maximum time to wait in milliseconds. Defaults to `30000` (30 seconds). Pass `0` to disable the timeout. Puppeteer's default timeout can be changed using [Page.setDefaultTimeout()](./puppeteer.page.setdefaulttimeout.md).