title: Selenium: How do I get the src of an image?
body: <p>I'm using Selenium (within PHPUnit) to test my web application. I would like to test whether a certain image which is present on the page really exists. More precisely, whether the image url returns 404 or not. In order to test that, I need to get the image url. Given the image locator, How do I get the value of its src attribute (its url)?</p>