This text delves into HTML and CSS integratively. Each chapter focuses on a variety of HTML and CSS elements, concurrently, in the context of practical examples. Instead of dissecting each feature myopically, this book considers each HTML and CSS element in combination with other elements that are needed to make a given case work. For example, in chapter 5, explanations on how to build a data form with input validation and error highlighting are provided, and topics such as positioning, management of pointer events, text effects, selector specificity, and background image placement are covered. The key philosophical principle guiding this series is that even simple software systems are synergistic combinations of diverse technologies and that successful learning of these technologies is best facilitated via detailed and, importantly, immersive examples. Building of functional mini-applications requires the fluent use of a broad range of HTML and CSS vocabularies. The cases presented within these pages fully capture the richness of the HTML and CSS languages.