The document discusses HTML5 and slicing templates. It introduces HTML5, explaining what it is and is not. It describes new HTML5 tags like <header>, <nav>, <section>, <article>, and <footer> that provide semantic structure. It also covers new HTML5 features like simplified tags, internationalization, multimedia, graphics, forms, and APIs. The document recommends a default slicing template for creating uniform website designs and provides contact information for the authors.