Shadow DOM feature of HtmlUnit doesn't appear to work #187

package com.nordstrom.automation.selenium.model;

import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.MutableCapabilities;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.htmlunit.HtmlUnitDriver;
import org.testng.annotations.Test;

public class FooBar {
	
	@Test
	public void foo() {
		MutableCapabilities caps = new MutableCapabilities();
		caps.setCapability("browserName", "htmlunit");
		caps.setCapability("browserVersion", "chrome");
		caps.setCapability("javascriptEnabled", true);
		HtmlUnitDriver driver = new HtmlUnitDriver(caps);
		driver.get("file:/C:/github/Selenium-Foundation/target-s3/test-classes/ExamplePage.html");
		WebElement elem = driver.findElement(By.cssSelector("div#shadow-root-a"));
		Object bar = ((JavascriptExecutor) driver).executeScript("return arguments[0].shadowRoot;", elem);
	}

}