Browser Storage Abuser is a tool to experiment your browser storage limitation on LocalStorage, SessionStorage, WebSQL Database, IndexedDB API and FileSystem API. You can add arbitrary sized files to those storage to see the limit of their size.
The HTML dialog element provides in-page dialog box functionality. A dialog exists in the DOM tree and can be styled using ordinary CSS.
Thought on HTML5 ads. Imagine you clicked on an beverage company's ad. Best viewed on mobile safari. Try shake your iPhone.