current_url = new URL(await page.url());
assert.deepStrictEqual(current_url.pathname, '/details.html');
await page.waitForSelector('.container h1');
page_header = await page.$eval('.container h1', el => el.textContent);
current_url = new URL(await page.url());
assert.deepStrictEqual(current_url.pathname, '/details.html');
await page.waitForSelector('.container h1');
page_header = await page.$eval('.container h1', el => el.textContent);