Book Image

Mastering Responsive Web Design

By : Ricardo Zea
Book Image

Mastering Responsive Web Design

By: Ricardo Zea

Overview of this book

Building powerful and accessible websites and apps using HTML5 and CSS3 is a must if we want to create memorable experiences for our users. In the ever-changing world of web design and development, being proficient in responsive web design is no longer an option: it is mandatory. Each chapter will take you one step closer to becoming an expert in RWD. Right from the start your skills will be pushed as we introduce you to the power of Sass, the CSS preprocessor, to increase the speed of writing repetitive CSS tasks. We’ll then use simple but meaningful HTML examples, and add ARIA roles to increase accessibility. We’ll also cover when desktop-first or mobile-first approaches are ideal, and strategies to implement a mobile-first approach in your HTML builds. After this we will learn how to use an easily scalable CSS grid or, if you prefer, how to use Flexbox instead. We also cover how to implement images and video in both responsive and responsible ways. Finally, we build a solid and elegant typographic scale, and make sure your messages and communications display correctly with responsive emails.
Table of Contents (16 chapters)
Mastering Responsive Web Design
About the Author
About the Reviewers

Replacing 1x images with 2x images on the fly with Retina.js

The Retina.js script is one of those scripts that makes things so much easier that sometimes you wonder why responsive images are so difficult.

If you don't feel ready to deal with the <picture> and/or srcset and sizes attributes, I don't blame you. It's scary but I recommend that you keep trying to understand these tools since that's the state of the art of responsive images.

The Retina.js script was developed by the folks at Imulus ( The Retina.js script isn't a JavaScript-only solution; they also have a Sass mixin that produces the same results without the dependency on JavaScript.

Let's take a look at the JavaScript solution first.

Retina.js – a JavaScript solution

Using the script couldn't be any simpler. We need to download the script from

Then, we place the script at the bottom of the HTML, right before the closing <body> tag: