The goal of this workshop is to investigate the testing challenges posed by the future Web. Client side technologies - such as Ajax - introduce a complex, dynamic and stateful execution model, involving asynchronous interactions with the server. Server side applications organized as services, possibly around an enterprise service bus, offer interesting opportunities for dynamic discovery, replacement and composition. Adaptivity and autonomy aim at improving the user experience both at the client and at the server side, through capabilities such as self-configuration and self-healing. Testing of each one of these technologies, as well as their integration, demands for novel approaches and is expected to trigger major research efforts in the area.