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The page you are looking for is no longer available at this URL.

Links to the multipage version of the specification are unfortunately likely to break over time. You might be able to find what you want from the contents page.

If you have found a broken link on the WHATWG site itself, please file an issue. If you found a broken link from another site pointing to the WHATWG site, please let that site know of the problem instead. Thanks!