{"id":6358,"date":"2023-12-22T21:03:45","date_gmt":"2023-12-22T12:03:45","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=6358"},"modified":"2024-01-24T15:00:37","modified_gmt":"2024-01-24T06:00:37","slug":"css-pseudo-elements","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/css-pseudo-elements\/","title":{"rendered":"\u3010CSS\u3011\u64ec\u4f3c\u8981\u7d20\u3068\u306f\uff1f::before\u3084::after\u306e\u4f7f\u3044\u65b9\u3092\u89e3\u8aac"},"content":{"rendered":"<p>CSS\u306e\u8981\u7d20\u540d\u3084\u30af\u30e9\u30b9\u540d\u306e\u5f8c\u306b\u300c:before\u300d\u3084\u300c:after\u300d\u3068\u3044\u3063\u305f\u8a18\u8ff0\u304c\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u300c\u64ec\u4f3c\u8981\u7d20\u300d\u3068\u3044\u3044\u3001HTML\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u305a\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002\u3068\u3066\u3082\u4fbf\u5229\u306a\u8981\u7d20\u306a\u306e\u3067\u305d\u306e\u8a18\u8ff0\u65b9\u6cd5\u3084\u4f7f\u7528\u5834\u9762\u3092\u5341\u5206\u306b\u7406\u89e3\u3057\u3066\u6d3b\u7528\u3057\u307e\u3057\u3087\u3046\u3002\u672c\u8a18\u4e8b\u3067\u306f\u305d\u306e\u64ec\u4f3c\u8981\u7d20\u306e\u57fa\u672c\u304b\u3089\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u7528\u3044\u305f\u6d3b\u7528\u4f8b\u307e\u3067\u6bb5\u968e\u7684\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">\u64ec\u4f3c\u8981\u7d20\u3068\u306f<\/h2>\n\n\n<p><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">CSS\u306e\u64ec\u4f3c\u8981\u7d20\u3068\u306f\u3001\u30bb\u30ec\u30af\u30bf\u306b\u4ed8\u52a0\u3059<\/span><\/span>\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u3001\u8981\u7d20\u306e\u9818\u57df\u306b\u30b3\u30f3\u30c6\u30f3\u30c4\u3084\u30b9\u30bf\u30a4\u30eb\u3092\u4ed8\u52a0\u3059\u308b\u3082\u306e\u3067\u3059\u3002CSS\u3067\u64ec\u4f3c\u7684\u306bHTML\u8981\u7d20\u3092\u4f5c\u308b\u306e\u3067<span style=\"color: #0000ff;\"><span style=\"color: #000000;\">HTML\u30b3\u30fc\u30c9\u306b\u5909\u66f4\u3092\u52a0\u3048\u308b\u3053\u3068\u306a\u304f\u8981\u7d20\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002<\/span><\/span><\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u300c::before\u300d\u3084\u300c::after\u300d\u3067\u9078\u629e\u3057\u305f\u8981\u7d20\u306e\u524d\u5f8c\u306b\u6587\u5b57\u3092\u8ffd\u52a0\u3057\u305f\u308a\u3001\u300c::first-line\u300d\u3084\u300c::first-letter\u300d\u3067\u30c6\u30ad\u30b9\u30c8\u306e1\u884c\u76ee\u30841\u6587\u5b57\u76ee\u306e\u6587\u5b57\u306e\u8272\u3084\u30b5\u30a4\u30ba\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<div style=\"margin-top:4%;\">\n<a href=\"https:\/\/techmania.jp\/\"><\/a><p style=\"text-align:center; text-decoration:underline black; font-weight:bold;\">\u3042\u306a\u305f\u306e\u3054\u5e0c\u671b\u306b\u6cbf\u3063\u305f\u6848\u4ef6\u304c<span style=\"color: red;\">\u5fc5\u305a<\/span>\u898b\u3064\u304b\u308a\u307e\u3059<br>\u3010\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u5411\u3051\u3011<span style=\"color: red;\">\u9ad8\u53ce\u5165<\/span>\u30fb<span style=\"color: blue;\">\u597d\u5f85\u9047<\/span>\u306e\u6848\u4ef6\u3092\u3054\u7d39\u4ecb<\/p><\/a>\n<\/div>\n<div style=\"text-align:center; margin-top:1%;\"><a href=\"https:\/\/techmania.jp\/\"><img decoding=\"async\" style=\"filter: drop-shadow(0px 0px 3px rgba(0,0,0,0.3)); width:300px;\" alt=\"TECH MANIA \u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\" src=\"https:\/\/techmania.jp\/blog\/wp-content\/uploads\/2024\/01\/fl1.png\"><\/a><\/div>\n<div>\n<a href=\"https:\/\/techmania.jp\/\"><\/a><p style=\"margin-top: 1%;text-align:center; text-decoration:underline black; font-weight:bold;\">\u226b\u307e\u305a\u306f\u7c21\u5358<span style=\"color: blue;\">30<\/span>\u79d2\u3067<span style=\"color: red;\">\u7121\u6599\u304a\u554f\u3044\u5408\u308f\u305b<\/span>\u304b\u3089\u226a<\/p><\/a>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">\u64ec\u4f3c\u8981\u7d20\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">\u64ec\u4f3c\u8981\u7d20\u306e\u8a18\u8ff0\u65b9\u6cd5<\/h3>\n\n\n<p>\u64ec\u4f3c\u8981\u7d20\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u30bb\u30ec\u30af\u30bf\uff08\u30bf\u30b0\u540d\u3084\u30af\u30e9\u30b9\u540d\u3001id\u540d\u306a\u3069\uff09\u306e\u3042\u3068\u306b\u300c::\uff08\u30c0\u30d6\u30eb\u30b3\u30ed\u30f3\uff09\u300d\u3092\u4ed8\u3051\u3066\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>\u30bb\u30ec\u30af\u30bf::\u64ec\u4f3c\u8981\u7d20{\n  \u30d7\u30ed\u30d1\u30c6\u30a3:\u5024;\n}<\/code><\/pre>\n\n\n<p>\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3067\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;p&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>p::before{\n  content:\"\u300c\";\n  color:blue;\n}\np::after{\n  content:\"\u300d\";\n  color:blue;\n}<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/cpe1.png\" class=\"post-img\">\n\n\n<p><span style=\"color: #000000;\">\u4e0a\u8a18\u3067\u306f\u3001\u8981\u7d20\u5185\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u524d\u5f8c\u306b\u64ec\u4f3c\u8981\u7d20\u3092\u8ffd\u52a0\u3057\u3066\u304a\u308a\u3001\u300c\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8\u300d\u3068\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">::before\u307e\u305f\u306f::after\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u306f\u5fc5\u305acontent\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002content\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u306b\u306f\u3001\u30c6\u30ad\u30b9\u30c8\u3084\u753b\u50cf\u3001\u97f3\u58f0\u306a\u3069\u3092\u633f\u5165\u3067\u304d\u307e\u3059\u3002\u30c6\u30ad\u30b9\u30c8\u3084\u8a18\u53f7\u3092\u64ec\u4f3c\u8981\u7d20\u3068\u3057\u3066\u633f\u5165\u3059\u308b\u5834\u5408\u306f\u3001content\u306e\u5024\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002\u753b\u50cf\u306a\u3069\u3092\u633f\u5165\u3059\u308b\u5834\u5408\u306f\u3001content\u3092\u7a7a\uff08content:&#8221;&#8221;;\uff09\u306b\u3057\u3001\u64ec\u4f3c\u8981\u7d20\u306b\u300cposition: absolute;\u300d\u3001\u64ec\u4f3c\u8981\u7d20\u3092\u3064\u3051\u305f\u8981\u7d20\u306b\u300cposition: relative;\u300d\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/span><\/p>\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">\u30b3\u30ed\u30f3(:)\u306e\u6570<\/h3>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>\u64ec\u4f3c\u8981\u7d20<\/strong><\/td><td>::\uff08\u30c0\u30d6\u30eb\u30b3\u30ed\u30f3\uff09<\/td><\/tr><tr><td><strong>\u64ec\u4f3c\u30af\u30e9\u30b9<\/strong><\/td><td>:\uff08\u30b7\u30f3\u30b0\u30eb\u30b3\u30ed\u30f3\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>\u64ec\u4f3c\u8981\u7d20\u306e\u524d\u306b\u4e8c\u91cd\u306e\u30b3\u30ed\u30f3\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u5358\u4e00\u306e\u30b3\u30ed\u30f3\u3092\u4f7f\u7528\u3059\u308b\u300c\u64ec\u4f3c\u30af\u30e9\u30b9\u300d\u3068\u533a\u5225\u3059\u308b\u305f\u3081\u3067\u3059\u30021\u3064\u306e\u30bb\u30ec\u30af\u30bf\u306b\u3064\u304d\u4f7f\u7528\u3067\u304d\u308b\u64ec\u4f3c\u8981\u7d20\u306f1\u3064\u3067\u3059\u3002<\/p>\n<p>CSS\u306e\u6700\u65b0\u898f\u683c\u3067\u3042\u308bCSS3\u3067\u306f\u64ec\u4f3c\u30af\u30e9\u30b9\u306f\u300c:\uff08\u30b7\u30f3\u30b0\u30eb\u30b3\u30ed\u30f3\uff09\u300d\u3001\u64ec\u4f3c\u8981\u7d20\u306f\u300c::\uff08\u30c0\u30d6\u30eb\u30b3\u30ed\u30f3\uff09\u300d\u3067\u8a18\u8ff0\u3059\u308b\u3088\u3046\u5b9a\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3001\u4ee5\u524d\u306e\u898f\u683c\u3067\u3042\u308bCSS2\u3084IE8\u3067\u306f\u64ec\u4f3c\u8981\u7d20\u3092\u300c:\uff08\u30b7\u30f3\u30b0\u30eb\u30b3\u30ed\u30f3\uff09\u300d\u3067\u8a18\u8ff0\u3059\u308b\u3053\u3068\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u3069\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u3067\u533a\u5225\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">\u7591\u4f3c\u8981\u7d20\u3068\u7591\u4f3c\u30af\u30e9\u30b9\u306e\u9055\u3044<\/h2>\n\n\n<p>\u64ec\u4f3c\u8981\u7d20\u306f\u90e8\u5206\u7684\u306a\u30b9\u30bf\u30a4\u30eb\u306e\u5909\u66f4\u3084\u30c6\u30ad\u30b9\u30c8\u3084\u753b\u50cf\u306e\u8ffd\u52a0\u306b\u4f7f\u308f\u308c\u308b\u64ec\u4f3c\u8981\u7d20\u306b\u5bfe\u3057\u3066\u64ec\u4f3c\u30af\u30e9\u30b9\u306f\u3001\u6587\u7ae0\u69cb\u9020\u306e\u7bc4\u56f2\u5916\u3068\u306a\u308b\u60c5\u5831\u3084\u3001\u7279\u5b9a\u306e\u8981\u7d20\u306e\u307f\u306b\u5909\u66f4\u3092\u52a0\u3048\u308b\u5834\u5408\u306b\u3001\u5358\u4f53\u306e\u30bb\u30ec\u30af\u30bf\u3067\u306f\u8868\u73fe\u3067\u304d\u306a\u3044\u3082\u306e\u306b\u5bfe\u3057\u3066\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<p>\u7591\u4f3c\u8981\u7d20\u306f\u8981\u7d20\u306e\u524d\u5f8c\u30841\u6587\u5b57\u76ee\u30011\u884c\u76ee\u306a\u3069\u3001\u300c\u6307\u5b9a\u3057\u305f\u8981\u7d20\u306e\u4e00\u90e8\u300d\u306b\u5bfe\u3057\u3066\u30b3\u30f3\u30c6\u30f3\u30c4\u3084\u30b9\u30bf\u30a4\u30eb\u3092\u4ed8\u52a0\u3059\u308b\u306e\u306b\u5bfe\u3057\u3001\u7591\u4f3c\u30af\u30e9\u30b9\u306f\u7279\u5b9a\u306e\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u300c\u6307\u5b9a\u3057\u305f\u8981\u7d20\u5168\u4f53\u300d\u306b\u5bfe\u3057\u3066\u9069\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__3_1\" class=\"wp-block-heading\">\u7591\u4f3c\u8981\u7d20\u3068\u7591\u4f3c\u30af\u30e9\u30b9\u3092\u4f75\u7528\u3059\u308b\u5834\u5408\u306e\u8a18\u8ff0\u9806<\/h3>\n\n\n<p>\u7591\u4f3c\u8981\u7d20\u3068\u7591\u4f3c\u30af\u30e9\u30b9\u3092\u4f75\u7528\u3059\u308b\u5834\u5408\u306f\u300c:\u7591\u4f3c\u30af\u30e9\u30b9::\u7591\u4f3c\u8981\u7d20\u300d\u3068\u3044\u3046\u9806\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<br \/>\u9006\u306e\u9806\u756a\u3067\u8a18\u8ff0\u3057\u3066\u3057\u307e\u3046\u3068\u53cd\u6620\u3055\u308c\u306a\u3044\u305f\u3081\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">\u7591\u4f3c\u8981\u7d20\u3092\u4f7f\u7528\u3059\u308b\u30e1\u30ea\u30c3\u30c8<\/h2>\n\n\n<p>\u64ec\u4f3c\u8981\u7d20\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001HTML\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u305a\u306bCSS\u3067\u64ec\u4f3c\u7684\u306bHTML\u8981\u7d20\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002HTML\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u8a18\u8ff0\u91cf\u304c\u591a\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u3068\u3001\u3067\u591a\u304f\u66f8\u3044\u3066\u3057\u307e\u3046\u3068\u3001\u30b3\u30fc\u30c9\u304c\u8aad\u307f\u3065\u3089\u304f\u306a\u3063\u3066\u4fdd\u5b88\u6027\u304c\u4e0b\u304c\u308b\u4e0a\u306b\u3001SEO\u306b\u3082\u52b9\u679c\u7684\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306fHTML\u3067\u8a18\u8ff0\u3055\u308c\u305f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u307f\u3092\u898b\u308b\u306e\u3067\u3001\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u306b\u8a18\u8ff0\u3057\u305f\u3082\u306e\u306fSEO\u306b\u4f59\u8a08\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u306a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">\u7591\u4f3c\u8981\u7d20\u3092\u4f7f\u7528\u3059\u308b\u30c7\u30e1\u30ea\u30c3\u30c8<\/h2>\n\n\n<p>\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u306a\u3044\u3068\u3044\u3046\u306e\u306f\u30e1\u30ea\u30c3\u30c8\u3067\u3042\u308b\u53cd\u9762\u3001\u30c7\u30e1\u30ea\u30c3\u30c8\u3067\u3082\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u7591\u4f3c\u8981\u7d20\u306b\u633f\u5165\u3057\u305f\u30c6\u30ad\u30b9\u30c8\u306b\u300c\u65b0\u7740\u300d\u3084\u300c\u91cd\u8981\u300d\u3068\u3044\u3063\u305f\u3001\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306b\u62fe\u3063\u3066\u307b\u3057\u3044\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u66f8\u3044\u305f\u3068\u3057\u3066\u3082\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306fHTML\u3067\u306f\u8a18\u8ff0\u3055\u308c\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306b\u306f\u8a8d\u8b58\u3055\u308c\u307e\u305b\u3093<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u7591\u4f3c\u8981\u7d20\u306f\u3042\u304f\u307e\u3067\u30b9\u30bf\u30a4\u30eb\u306e\u8ffd\u52a0\u3092\u306b\u3059\u308b\u306e\u304c\u3044\u3044\u3067\u3057\u3087\u3046\u3002\u307e\u305f\u3001JavaScript\u3084jOuery\u306a\u3069\u3067\u8981\u7d20\u3092\u52d5\u304b\u3057\u305f\u3044\u5834\u5408\u306b\u3082\u4e0d\u5411\u304d\u3067\u3059\u3002HTML\u306b\u66f8\u304f\u304b\u3001\u7591\u4f3c\u8981\u7d20\u3068\u3057\u3066CSS\u306b\u66f8\u304f\u304b\u3001\u76ee\u7684\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n\n\n<h2 id=\"outline__6\" class=\"wp-block-heading\">\u64ec\u4f3c\u8981\u7d20\u306e\u4e00\u89a7<\/h2>\n\n\n<p>\u64ec\u4f3c\u8981\u7d20\u306b\u306f\u3044\u304f\u3064\u304b\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002\u203b\u4e00\u90e8\u629c\u7c8b<\/p>\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>::after<\/strong><\/td><td>\u8981\u7d20\u306e\u5f8c<\/td><\/tr><tr><td><strong>::backdrop<\/strong><\/td><td>\u5168\u753b\u9762\u30e2\u30fc\u30c9\u306b\u304a\u3051\u308b\u4f59\u767d\u306e\u8272<\/td><\/tr><tr><td><strong>::before<\/strong><\/td><td>\u8981\u7d20\u306e\u524d<\/td><\/tr><tr><td><strong>::first-letter<\/strong><\/td><td>\u30d6\u30ed\u30c3\u30af\u8981\u7d20\u306e1\u884c\u76ee\u306e1\u6587\u5b57\u76ee<\/td><\/tr><tr><td><strong>::first-line<\/strong><\/td><td>\u30d6\u30ed\u30c3\u30af\u8981\u7d20\u306e1\u884c\u76ee<\/td><\/tr><tr><td><strong>::marker<\/strong><\/td><td>\u30ea\u30b9\u30c8\u9805\u76ee\u306e\u7b87\u6761\u66f8\u304d\u8a18\u53f7\u30dc\u30c3\u30af\u30b9<\/td><\/tr><tr><td><strong>::placeholder<\/strong><\/td><td>input\u307e\u305f\u306ftextarea\u8981\u7d20\u306e\u30d7\u30ec\u30a4\u30b9\u30db\u30eb\u30c0\u30fc\u6587\u5b57\u5217<\/td><\/tr><tr><td><strong>::selection<\/strong><\/td><td>\u30e6\u30fc\u30b6\u304c\u30c9\u30e9\u30c3\u30b0\u64cd\u4f5c\u306b\u3088\u3063\u3066\u9078\u629e\u3057\u305f\u30c6\u30ad\u30b9\u30c8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 id=\"outline__7\" class=\"wp-block-heading\">\u4f7f\u7528\u5834\u9762<\/h2>\n\n\n<p>\u64ec\u4f3c\u8981\u7d20\u306e\u306a\u304b\u304b\u3089\u3001\u5b9f\u52d9\u3067\u4f7f\u3044\u3084\u3059\u3044\u3082\u306e\u3092\u629c\u7c8b\u3057\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__7_1\" class=\"wp-block-heading\">::before\uff0f::after<\/h3>\n\n\n<p><span style=\"font-size: revert;\">::before\u3068::after\u306f\u3001\u8981\u7d20\u306e\u524d\u5f8c\u306b\u64ec\u4f3c\u7684\u306b\u8981\u7d20\u3092\u4f5c\u6210\u3067\u304d\u308b\u7591\u4f3c\u8981\u7d20\u3067\u3059\u3002<\/span><span style=\"font-size: revert;\">content\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u542b\u3080\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/span><span style=\"font-size: revert;\">content\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u306f\u300c&#8217;\uff08<\/span><span style=\"font-size: revert;\">\u30af\u30aa\u30fc\u30c8\uff09\u300d\u306e\u9593\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/span><span style=\"font-size: revert;\">\u300c&#8217; &#8216;\u300d\u5185\u306f\u7a7a\u3067\u3082\u554f\u984c\u3042\u308a\u307e\u305b\u3093<\/span><span style=\"font-size: revert;\">\u3002<\/span><span style=\"font-size: revert;\">\u307e\u305f\u3001\u64ec\u4f3c\u8981\u7d20\u3067\u6307\u5b9a\u3057\u305f\u30b9\u30bf\u30a4\u30eb\u3092\u89e3\u9664\u3059\u308b\u5834\u5408\u306f\u3001content\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u300cnone\u300d\u306b\u6307\u5b9a\u3057\u307e\u3059\u3002<\/span><\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;p&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;br&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;\n&lt;p&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>p::before{\n  content:\"\u2605\";\n  color:orange;\n}<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/cpe6.png\" class=\"post-img\">\n\n\n\n<h3 id=\"outline__7_2\" class=\"wp-block-heading\">::backdrop<\/h3>\n\n\n<p>::backdrop\u306f\u3001\u5168\u753b\u9762\u8868\u793a\u6642\u306e\u4f59\u767d\u90e8\u5206\u306e\u8272\u3092\u8abf\u6574\u3059\u308b\u7591\u4f3c\u8981\u7d20\u3067\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u4f59\u767d\u90e8\u5206\u306f\u9ed2\u304f\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;video src=\"\uff5e\uff5e\uff5e\"&gt;&lt;\/video&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>video::backdrop{\n background-color:green;\n}<\/code><\/pre>\n\n\n\n<h3 id=\"outline__7_3\" class=\"wp-block-heading\">::first-line<\/h3>\n\n\n<p>::first-line\u306f\u3001\u30c6\u30ad\u30b9\u30c8\u306e\u5148\u982d\u306e1\u884c\u76ee\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u6307\u5b9a\u3067\u304d\u308b\u64ec\u4f3c\u8981\u7d20\u3067\u3059\u3002a\u30bf\u30b0\u3084img\u30bf\u30b0\u306a\u3069\u306e\u30a4\u30f3\u30e9\u30a4\u30f3\u8981\u7d20\u306b\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;p&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;br&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;\n&lt;p&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>p::first-line{\n color:blue;\n}<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/cpe4.png\" class=\"post-img\">\n\n\n\n<h3 id=\"outline__7_4\" class=\"wp-block-heading\">::first-letter<\/h3>\n\n\n<p>::first-letter\u306f\u3001\u30c6\u30ad\u30b9\u30c8\u306e\u5148\u982d\u306e1\u884c\u306e1\u6587\u5b57\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u6307\u5b9a\u3067\u304d\u308b\u64ec\u4f3c\u8981\u7d20\u3067\u3059\u3002\u3053\u3061\u3089\u3082a\u30bf\u30b0\u3084img\u30bf\u30b0\u306a\u3069\u306e\u30a4\u30f3\u30e9\u30a4\u30f3\u8981\u7d20\u306b\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;p&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;br&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;\n&lt;p&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>p::first-letter{\n color:red;\n font-weight:bold; \/*\u592a\u5b57\u306b\u3059\u308b*\/\n}<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/cpe5.png\" class=\"post-img\">\n\n\n\n<h3 id=\"outline__7_5\" class=\"wp-block-heading\">::marker<\/h3>\n\n\n<p><span style=\"color: #000000;\">::marker\u306f\u3001list\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306b\u8868\u793a\u3055\u308c\u308b\u8981\u7d20\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u5909\u66f4\u3059\u308b\u64ec\u4f3c\u8981\u7d20\u3067\u3059\u3002<\/span><\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;ul class=\"list\"&gt;\n &lt;li&gt;\u30ea\u30b9\u30c8&lt;\/li&gt;\n &lt;li&gt;\u30ea\u30b9\u30c8&lt;\/li&gt;\n &lt;li&gt;\u30ea\u30b9\u30c8&lt;\/li&gt;\n &lt;li&gt;\u30ea\u30b9\u30c8&lt;\/li&gt;\n&lt;\/ul&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>.list li::marker{\n color:gray;\n font-size:2em; \/*\u30b5\u30a4\u30ba\u30922\u500d\u306b\u3059\u308b*\/\n}<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/cpe7.png\" class=\"post-img\">\n\n\n\n<h3 id=\"outline__7_6\" class=\"wp-block-heading\">::placeholder<\/h3>\n\n\n<p><span style=\"color: #000000;\">::placeholder\u306f\u3001input\u307e\u305f\u306ftextarea\u306e\u30d7\u30ec\u30a4\u30b9\u30db\u30eb\u30c0\u30fc\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u5909\u66f4\u3059\u308b\u64ec\u4f3c\u8981\u7d20\u3067\u3059\u3002<\/span><\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;input type=\"text\" class=\"placeholder\" placeholder=\"\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8\"&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>.placeholder::placeholder{\n color:blue;\n font-weight:bold;\n font-size:10px;\n}\n<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/cpe8.png\" class=\"post-img\">\n\n\n\n<h3 id=\"outline__7_7\" class=\"wp-block-heading\">::selection<\/h3>\n\n\n<p><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">::selection\u306f\u3001\u30e6\u30fc\u30b6\u304c\u30c9\u30e9\u30c3\u30b0\u64cd\u4f5c\u3067\u9078\u629e\u3057\u305f\u30c6\u30ad\u30b9\u30c8\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u64ec\u4f3c\u8981\u7d20\u3067\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3060\u3068\u80cc\u666f\u306e\u8272\u304c\u9752\u3067\u6587\u5b57\u306e\u8272\u304c\u767d\u3067\u3059\u3002<\/span><\/span><\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;p class=\"selection\"&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>.selection::selection{\n background-color:yellow;\n color:red;\n}<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/cpe9.png\" class=\"post-img\">\n\n\n\n<h2 id=\"outline__8\" class=\"wp-block-heading\">\u64ec\u4f3c\u8981\u7d20\u3067\u3067\u304d\u308b\u3053\u3068<\/h2>\n\n\n<p><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">\u3044\u304f\u3064\u304b\u64ec\u4f3c\u8981\u7d20\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u304c\u3001\u5b9f\u52d9\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u306e\u306f\u3084\u306f\u308a::before\u3084::after\u3067\u3059\u3002\u3053\u3053\u304b\u3089\u306f::before\u3084::after\u306e\u4f7f\u3044\u65b9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/span><\/span><\/p>\n\n\n<h3 id=\"outline__8_1\" class=\"wp-block-heading\">\u753b\u50cf\u3092\u8868\u793a\u3059\u308b<\/h3>\n\n\n<p>content\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u306b\u300curl\uff08\u753b\u50cf\u306e\u30d1\u30b9)\u300d\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u64ec\u4f3c\u8981\u7d20\u3068\u3057\u3066\u753b\u50cf\u3092\u8868\u793a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>\u3010HTML\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;p&gt;\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;<\/code><\/pre>\n\n\n<p><strong>\u3010CSS\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>p::before{\n content:url(\"\uff5e\uff5e\uff5e\uff5e\");\n display:block; 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