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资源说明：While we may not provide a full list of all the features of HTML5 and browser support
for them—depending on the recipe—we do discuss the support for each of the individualelements and implementations covered throughout this book (for tips on finding
out what browsers currently support what parts of the specification, see Recipe 2.3,
“Understanding Browser Support for HTML5”).
We also cover workarounds to implement when browser support is patchy, and why
you may or may not need them. This way, you can decide for yourself if a particular
feature works for you, your client, or your employer.
And that’s our value to you, dear reader. Using HTML5 isn’t an absolute proposition.
You don’t have to use embedded content or web sockets to use the new structural
elements, and vice versa. You don’t even have to use the new structural elements to
have a valid HTML5 document; you just need the Document Type Definition.
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