What is the method for verifying the presence of an element on a page in Playwright.js?

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The method for verifying the presence of an element on a page in Playwright.js is using the "waitForSelector()" function. This function waits for the specified selector to appear on the page before continuing with the execution of the script. If the selector is not found within the specified timeout, the function will throw an error.

Example:

await page.waitForSelector('h1');

This code will wait for the presence of an "h1" element on the page before continuing with the script.