The book WebGL Insights is now available for free as a PDF download. Published in 2015, CRC Press has made the book available for free, and it can be downloaded from the WebGL Insights Github page.

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WebGL Insights presents real-world techniques for intermediate and advanced WebGL developers by assembling contributions from experienced WebGL engine and application developers, GPU vendors, browser developers, researchers, and educators. By focusing on current and emerging techniques , WebGL Insights demonstrates the breadth and depth of WebGL. Readers will gain practical skills to solve problems related to performance, engine design, shader pipelines, rendering, mobile devices, testing, and more.

Learn more from the book's website.

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A bunch of weird red flags come up when I try to follow any of the links that lead to the pdf.  Firefox wont let me navigate to any of those pages.