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dynamically render favicons for a variety of sizes
<%= favicon_link_tag asset_path('your logo path') %>
<% %w(32 128 76 120 152 167 180 192 196).each do |size| %>
<%= favicon_link_tag "/icons/your-logo.png", rel: 'apple-touch-icon', type: 'image/png', sizes: "#{size}x#{size}" %>
<% end %>
<% %w(16 32).each do |size| %>
<%= favicon_link_tag "/icons/your-logo.png", rel: 'icon', type: 'image/png', sizes: "#{size}x#{size}" %>
<% end %>
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