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# app/assets/images/favicon.ico
<%= favicon_link_tag('favicon.ico') %>

# iOSアイコン
# app/assets/images/apple-touch-icon-180x180.png
<%= favicon_link_tag('apple-touch-icon-180x180.png',
                     {:rel => 'apple-touch-icon',
                      :sizes => '180x180',
                      :type => 'image/png'}) %>