Evaluates a function in the browser context. If the function, passed to the frame.evaluate, returns a Promise, then frame.evaluate would wait for the promise to resolve and return its value. If the function passed into frame.evaluate returns a non-Serializable value, then frame.evaluate resolves to undefined.
Arguments to pass to fn
The only difference between evaluate and evaluateHandle is that evaluateHandle returns in-page object (JSHandle).
If the function, passed to the evaluateHandle, returns a Promise, then evaluateHandle would wait for the
promise to resolve and return its value.
The TypeScript definitions assume that evaluateHandle returns a JSHandle, but if you know it's going to return an
ElementHandle, pass it as the generic argument:
a function that is run within the page
arguments to be passed to the pageFunction
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The Worker class represents a WebWorker. The events workercreated and workerdestroyed are emitted on the page object to signal the worker lifecycle.