[🐛 Bug]: FindElements By TagName doesn't work anymore inside Shadow root element

What happened?

When using version 4.0.0 and up of Selenium, I get this error now when trying to find elements by tag name inside a shadow root element

javascript error: b.getElementsByTagName is not a function
  (Session info: chrome=95.0.4638.69)

This error isn’t there when I use version 3.141.0 and it’s only when the find element is with tag name as far as I checked.

I’m using the x64 version of ChromeDriver 95.0.4638.69 and the application is in C# with .Net5.0

To reproduce, simply try it with Chrome download page.

How can we reproduce the issue?

[HttpGet("TestShadowRoot")]
        public bool TestShadowRoot()
        {
            try
            {
                var driver = new ChromeDriverNoOptions().GenerateDriver(); //Change this to generate the driver
                driver.Navigate().GoToUrl("chrome://downloads");
                var root = driver.FindElement(By.XPath("/*"));
                var shadowRoot = (IWebElement)((IJavaScriptExecutor)driver).ExecuteScript("return arguments[0].querySelector(arguments[1]).shadowRoot", 
                                                                                          root, 
                                                                                          new string[] { "downloads-manager" });
                var elements = shadowRoot.FindElements(By.TagName("cr-button"));
            }
            catch (Exception ex)
            {
                return false;
            }

            return true;
        }

Relevant log output

javascript error: b.getElementsByTagName is not a function
  (Session info: chrome=95.0.4638.69)

Operating System

Windows 10

Selenium version

C# 4.0.0

What are the browser(s) and version(s) where you see this issue?

Chrome 95.0.4638.69

What are the browser driver(s) and version(s) where you see this issue?

ChromeDriver 95.0.4638.69

Are you using Selenium Grid?

No response

[derRichter]

we can confirm this problem with chromedriver 96, all fine with driver 95.x on newest chrome-browser 96.x https://bugs.chromium.org/p/chromedriver/issues/detail?id=3958 https://bugs.chromium.org/p/chromedriver/issues/detail?id=3948 we use selenium version 3.141.59, hope there is no force to use selenium 4?

my workaround at the moment is to use or downgrade to version 95.0.4638.69. works also fine with chromium/chrome browser 96.x

good on this constellation is that we got no (error-)message like “This version of ChromeDriver only supports Chrome version…” or “Chrome version must be …”

hope the next stable of chromium-browser 97 is also compatible to chromedriver 95 or the other way round

[github-actions[bot]]

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