Playwright · Middle · Question 41 of 75

What does `page.evaluate()` do?

const width = await page.evaluate(() => window.innerWidth);

1Checks the page for JavaScript syntax errors
2Evaluates how fast the page scripts run
3Runs a function in the page and returns the result

Show the answer

Correct answer: Runs a function in the page and returns the result

Explanation

The function runs in the browser, so it can't use test variables unless passed as an argument. Results must be serializable.

Further reading

Playwright: Evaluating JavaScript ↗

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