Browser Support
You should understand by now that the multi-device web is unknowably vast and varied, that the range of browsers running on those devices is immense, and that even within those browsers there is a variety of versions and implementations (I hope you understand that, as most of the introduction was dedicated to trying to get that point across). That being the case, some of the features in this book may well not be implemented or may be implemented slightly differently.
Rather than covering the levels of implementation in the text, I treat every new feature as if it’s fully implemented and make a note of real-world implementation oddities and curiosities in Appendix M.
Also, cutting-edge standard proposals are subject to change, ...
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