This book isn’t a deep cut algorithm or theory book, it doesn’t provide the why’s and how’s of current React architecture or Vue logic, and it doesn’t cover the impetus for why the web is the way that it is today in any sort of depth. What it does do is give you a great overview and initial outline of many of the newly-available (in the last few years, anyway) APIs available to front-end code. Things like media queries in CSS, mobile-browser APIs in Javascript (location, battery, connectivity, etc.), and other reasonable APIs for writing more portable applications. It’s a great primer to understand what’s possible on… the modern web! (See what I did there? 😉)