title: By.ID and another argument of presence_of_element_located
body: <p>I am fairly new to selenium and just encountered the following code snippet.</p>
  
  <pre><code>try:
      element_present = EC.presence_of_element_located((By.ID, 'you_wontx_be'))
      WebDriverWait(browser, timeout2).until(element_present)
  except TimeoutException:
      pass
  </code></pre>
  
  <p>I believe the code waits until a certain element is loaded in browser. What does the tuple parameter expect as its first and second element?</p>