Converting an ElementHandle to a DOM element using puppeteer?

Use ElementHandle.evaluate():

const elementHandle = await page.waitForSelector('.selector-list li')

elementHandle.evaluate((domElement) => {
    domElement.tagName  
    // etc ...
})

---

Typescript:

const elementHandle: ElementHandle = await page.waitForSelector('.selector-list li')

elementHandle.evaluate((domElement) => {
    domElement.tagName  
    // etc ...
})

The better way would be to execute the code on the page via page.evaluate and return the results. That way you can return an array with values:

const result = await page.evaluate(() => {
    const elements = document.querySelectorAll(".selector-list li");
    // do something with elements, like mapping elements to an attribute:
    return Array.from(elements).map(element => element.tagName);
});

result will then be an array with the attribute values of tagName of each element.