This means that the URL in question has hreflang annotations, but has not defined the language/region attribute using HTML lang.
While Google and Yandex use hreflang to determine which URLs to display in regional search results, some search engines, such as Bing, use the HTML lang attribute.
If a URL uses hreflang, but not HTML lang, you may find that the language/region is not correctly interpreted by all search engines, which may result in the incorrect page being served in localised search results.
This Hint will trigger for any URL which has hreflang annotations but no HTML lang attribute.
Consider the URL: https://example.com/en/page-a/
The Hint would trigger for this URL if it had hreflang annotations:
<link rel="alternate" href="https://example.com/en/page-a/" hreflang="en-us" />
<link rel="alternate" href="https://example.com/fr/page-a/" hreflang="fr-fr" />
<link rel="alternate" href="https://example.com/de/page-a/" hreflang="de-de" />
but did not have a HTML lang attribute:
<meta http-equiv="content-language" content="en-gb">
In Sitebulb, this Hint is an Opportunity, as it represents a situation where you could optimize the site to potentially gain more search traffic.
Some search engines rely on HTML lang (instead of hreflang) to determine the language of a page, so if it is missing the language may not be correctly interpreted.
If this is an important traffic source (e.g. if the website exists in a market with high Bing usage), add the HTML lang attribute to all pages that have hreflang.
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