* Use HTML5 and not HTML 4.01, not transitional, not XHTML
** Possibly use [http://getbootstrap.com/ bootstrap] (version 3) or [http://html5boilerplate.com/ HTML5 Boilerplate] (or [http://angular-ui.github.io/bootstrap/ angular-ui] when using angular, use boostrap3 branch) to get a working pre-defined environment including compat-shims for IE, etc.
* Testing
** Use [http://pivotal.github.io/jasmine/ Jasmine] for JavaScript testing
** Use SeleniumHQ or [http://phantomjs.org/ PhantomJS] for automated testing
** Use static mock json objects under different URLs to provide mock server-side data for testing the webfrontend
* Clean URLs