link rel="alternate"」の意味とSEOを意識した正しい使い方 | WEB集客ラボ byGMO（GMO TECH）
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![Add new meta tag: Google's new "handheld" link alternate URL (D8) [#3077780] | Drupal.org](https://www.drupal.org/files/issues/2019-08-30/metatag-handheld-source.png "Add new meta tag: Google's new \"handheld\" link alternate URL (D8) [#3077780] | Drupal.org")
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HTML link rel attribute that matter for SEO explained - ContentKing
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