title: How to wait for a page finish render and get complated page source
body: <p>I used Selenium(version 4.1.0) in a C# project.I looked up a lot of information.
  This is My code</p>
  <pre><code>ChromeDriver driver = new ChromeDriver();
  driver.Navigate().GoToUrl(&quot;xxxx&quot;);
  var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(30));
  wait.Until(ExpectedConditions.ElementExists(By.Id(&quot;xxx&quot;)));
  context.Response.Write(driver.pageSource);
  </code></pre>
  <p>This is very effective for get full page html until I test <a href="https://jp.mercari.com" rel="nofollow noreferrer">https://jp.mercari.com</a>.
  It can not get full page.</p>
  <p>Is there any other way to get the complated page source?</p>