Prism.languages.css = { 'comment': /\/\*[\w\W]*?\*\//, 'atrule': { pattern: /@[\w-]+?.*?(;|(?=\s*\{))/i, inside: { 'rule': /@[\w-]+/ // See rest below } }, 'url': /url\((?:(["'])(\\(?:\r\n|[\w\W])|(?!\1)[^\\\r\n])*\1|.*?)\)/i, 'selector': /[^\{\}\s][^\{\};]*?(?=\s*\{)/, 'string': /("|')(\\(?:\r\n|[\w\W])|(?!\1)[^\\\r\n])*\1/, 'property': /(\b|\B)[\w-]+(?=\s*:)/i, 'important': /\B!important\b/i, 'function': /[-a-z0-9]+(?=\()/i, 'punctuation': /[(){};:]/ }; Prism.languages.css['atrule'].inside.rest = Prism.util.clone(Prism.languages.css); if (Prism.languages.markup) { Prism.languages.insertBefore('markup', 'tag', { 'style': { pattern: /()[\w\W]*?(?=<\/style>)/i, lookbehind: true, inside: Prism.languages.css, alias: 'language-css' } }); Prism.languages.insertBefore('inside', 'attr-value', { 'style-attr': { pattern: /\s*style=("|').*?\1/i, inside: { 'attr-name': { pattern: /^\s*style/i, inside: Prism.languages.markup.tag.inside }, 'punctuation': /^\s*=\s*['"]|['"]\s*$/, 'attr-value': { pattern: /.+/i, inside: Prism.languages.css } }, alias: 'language-css' } }, Prism.languages.markup.tag); }