Working promises example

hello - the puppeteer code example contained the following:

            let elements    = await page.waitForSelector(cssSelector);
            let text        = await page.evaluate(element => element.textContent, elements);

my brain is having trouble with the last line i see element.textContent, elements – is this really two elements being passed

could i pelase ask somebody to please rewrite this line without the shortcuts so maybe it might make a bit more sense to this permanent-newbie brain of mine>
thank you.