Encountering a challenge in automating a polymer UI page using Selenium WebDriver. The obstacle I'm facing is the presence of "shadow root" elements within the polymer components, preventing the start of Selenium automation. Looking for suggestions, examples, or ideas on how to overcome this issue. Is it possible to automate Polymer UI with Selenium?
Selenium does not have built-in support for accessing elements within shadow DOM. One workaround is to use the JavaScript executor in Selenium by using `document.querySelector(...).shadowRoot` or by utilizing the "/deep/" combinator. The preferred method is using the "/deep/" combinator, as `querySelector` can be cumbersome when dealing with multiple levels of shadow DOM.
I discovered a way to access all elements within shadow roots:
`driver.find_elements_by_css_selector('body/deep/.layout.horizontal.center')`
This allows you to access elements with compound class names like "layout horizontal center" regardless of the number of shadow roots present. However, this approach only works with the Chrome driver and it's worth noting that "/deep/" is considered a deprecated method.
Updated on February 13th, 2019: A project has been developed to streamline shadow DOM automation in Selenium. Check out https://github.com/sukgu/shadow-automation-selenium. Originally designed for Ruby Watir framework, it can be used with any existing WebDriver that supports calling JavaScript methods. This tool can save time in test case development and maintenance, while also improving code readability and organization for easier debugging.
Spend just 5 minutes exploring how easy it is to integrate this tool into your current or new automation framework - it's a worthwhile investment!
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