Delivering your website's content in a multitude of languages can make it accessible to a wider range of audience. This can be done with help of the rel-alternate-hreflang annotation. This enables Google and other search engines to serve the correct language or regional version of pages to searchers which can lead to a better user-experience. Getting it right, however, can be a bit of a pain, which is why Google Webmasters Tools now has a feature for debugging hreflang annotations on your site.
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