OGP / Open Graph Protocol, favicon
<meta property="og:locale" content="ja_JP"> <meta property="og:type" content="website"> <meta property="og:title" content="TITLE"> <meta property="og:description" content="DESCRIPTION"> <meta property="og:image" content="IMAGE_FULL_URL"> Card Validator | Twitter Developers https://qiita.com/kana-t/items/f058f29ddd93e062761c https://qiita.com/kogache/items/9e49c94758be8c1c4d77 <link rel="shortcut icon" href="FAVICON_URL"> https://qiita.com/uraranbon/items/a143d215b7baa3e9d1a0