How to get all descendants of an element using webdriver?

Try this one:

(Java)

List<WebElement> childs = rootWebElement.findElements(By.xpath(".//*"));

(C#)

IReadOnlyList<IWebElement> childs = rootWebElement.FindElements(By.XPath(".//*"));

java collections selenium webdriver

Try this one

List<WebElement> allDescendantsChilds = rootWebElement.findElements(By.xpath("//tr[@class='parent']//*"));

The above thing will gives you all descendant child elements (not only immediate child) of parent tr

java collections selenium webdriver

Try this one:

List<WebElement> childs = rootWebElement.findElements(By.tagName(".//*"));

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