Acknowledgements

My debt to Mathew Butterick and his book Practical Typography are both obvious and immense. I’ve never met the gentleman, but this project would not have been possible without his example, nor without his beautiful font Valkyrie.

Thank you also to Tal Ater, whose Building Progressive Web Apps guided me through the slow process of doing just that.

A big hat tip to Jeremy Keith. Midway through developing this so-called Progressive Web Book I discovered that he had already beat me to the punch, and moreover, way back in 2016. His Resilient Web Design is an impressive achievement and a terrific, informative read.

Finally, a big thank-you to the incredible community of web designers and engineers who generously share their knowledge and expertise. They include:

• Fabrizio Bianchi, who developed Coolors, which I used to generate the book’s color palette.
• Z Creative Labs, which built Haikei, a great little app which I used to create the wavy SVGs for the cover and chapter titles.
• Google’s Lighthouse team, whose auditing tool helped me optimize the app’s performance and accessibility. (Now might be the time to brag about my almost perfect Lighthouse score.)
• And last but certainly not least, the countless, anonymous good samaritans who take the time to answer coding questions on Stack Overflow.