{"id":3078,"title":"\u88c5\u98feimg\u306a\u3089alt\u306f\u7a7a\u3067\u3044\u3044","slug":"html-alt-unnecessary","date":"2023\u5e7404\u670821\u65e5","voting":{"good":"0","bad":"0"},"modified":"2023\u5e7408\u670817\u65e5","tags":[{"name":"WebDevTopics","slug":"webdev-topics"},{"name":"Lighthouse","slug":"lighthouse"},{"name":"Web","slug":"web"},{"name":"\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3","slug":"%e3%82%a2%e3%82%af%e3%82%bb%e3%82%b7%e3%83%93%e3%83%aa%e3%83%86%e3%82%a3"},{"name":"W3C","slug":"w3c"},{"name":"SEO","slug":"seo"},{"name":"WebDev","slug":"webdev"}],"content":"\"SEO\" \"\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\" \u306e\u89b3\u70b9\u304b\u3089\u3001\u5fc5\u305a\u5165\u308c\u308b\u3079\u304d\u3060\u3068\u5ea6\u3005\u8a00\u308f\u308c\u308b`img`\u30bf\u30b0\u306e`alt`\u5c5e\u6027\u3060\u304c\u3001\u753b\u50cf\u81ea\u4f53\u304c\u610f\u5473\u3092\u6301\u305f\u306a\u3044\u5834\u5408\u306f`alt`\u5c5e\u6027\u306f\u7a7a\u3067\u826f\u3044\u3002\r\n\r\n```html\r\n<img src="icon.png" alt="" \/>\r\n```\r\n\r\n\u300cSEO\u7684\u306b`alt`\u5c5e\u6027\u3092\u6307\u5b9a\u3059\u308b\u3079\u304d\u300d\u3068\u3044\u3046\u4e3b\u5f35\u306f\u300c`alt`\u5c5e\u6027\u3092\u6307\u5b9a\u3059\u308b\u306a\u3069\u306e\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u7684\u306b\u512a\u308c\u305f\u30b5\u30a4\u30c8\u306fSEO\u7684\u306b\u3082\u8a55\u4fa1\u3055\u308c\u3084\u3059\u3044\u300d\u3068\u3044\u3046\u30ed\u30b8\u30c3\u30af\u3060\u3068\u7406\u89e3\u3057\u3066\u3044\u308b\u3002\r\n\r\n\u5b9f\u969b\u3001Google\u306e\u30b5\u30a4\u30c8\u54c1\u8cea\u3092\u6e2c\u5b9a\u3059\u308b\u30c4\u30fc\u30eb\u3067\u3042\u308bLighthouse\u306b\u306f\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\uff08\u65e5\u672c\u8a9e\u3067\u306f\u30e6\u30fc\u30b6\u30fc\u88dc\u52a9\uff09\u306b\u5206\u985e\u3055\u308c\u3066\u3044\u308b\u3002\r\n\r\n![Lighthouse\u306ealt\u5c5e\u6027\u306b\u3064\u3044\u3066\u306e\u9805\u76ee\u306f\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306b\u5206\u985e\u3055\u308c\u3066\u3044\u308b](https:\/\/yoshikitam.wpx.jp\/2001y\/wp-content\/uploads\/2023\/04\/CleanShot-2023-04-21-at-17.30.05@2x.png)\r\n\r\nalt\u5c5e\u6027\u306f\u753b\u50cf\u304c\u898b\u3048\u306a\u3044\u5834\u5408\u306b\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u308b\u3082\u306e\u3002\u5177\u4f53\u7684\u306b\u306f\u8996\u899a\u5f31\u8005\u306e\u65b9\u306a\u3069\u306e\u304c\u97f3\u58f0\u8aad\u307f\u4e0a\u3052\u6a5f\u80fd\u3092\u4f7f\u3046\u969b\u3084\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u5e2f\u57df\u4e0d\u8db3\u306a\u3069\u306b\u3088\u308a\u30d5\u30a1\u30a4\u30eb\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u5834\u5408\u306a\u3069\u304c\u300c\u753b\u50cf\u304c\u898b\u3048\u306a\u3044\u5834\u5408\u300d\u306b\u5f53\u305f\u308b\u3002\r\n\r\n\u305d\u3046\u3057\u305f\u6642\u306b\u3001\u88c5\u98fe\u7684\u306a\u753b\u50cf\uff08\u30dc\u30bf\u30f3\u306e\u30a2\u30a4\u30b3\u30f3\u306a\u3069\uff09\u306e\u7406\u89e3\u306f\u4e0d\u8981\u3068\u306a\u308b\u305f\u3081\u3001`alt`\u5c5e\u6027\u306f\u7a7a\u3067\u3088\u3044\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u3002\r\n\r\n\u3053\u3053\u3067\u9593\u9055\u3063\u3066\u306f\u3044\u3051\u306a\u3044\u306e\u306falt\u5c5e\u6027\u3092\u6307\u5b9a\u3057\u306a\u304f\u3066\u826f\u3044\u308f\u3051\u3067\u306f\u306a\u304falt\u5c5e\u6027\u3092\u7a7a\u306b\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\r\n\r\n```html\r\n<!-- ❌ --> <img src="icon.png" \/>\r\n<!-- ⭕️ --> <img src="icon.png" alt="" \/>\r\n<!-- 🔺 --> <img src="icon.png" alt="\u77e2\u5370\u306e\u30a2\u30a4\u30b3\u30f3" \/>\r\n```\r\n\r\n\u5b9f\u969b\u306bWeb\u306e\u56fd\u969b\u6a19\u6e96\u898f\u683c\u3068\u3057\u3066\u306e\u4ed5\u69d8\u306a\u3069\u3092\u7b56\u5b9a\u3057\u3066\u3044\u308b\u975e\u55b6\u5229\u56e3\u4f53\u3067\u3042\u308bW3C\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3055\u308c\u3055\u308c\u3066\u3044\u308b\u3002\r\n\r\n> \u3053\u306e\u9054\u6210\u65b9\u6cd5\u306e\u76ee\u7684\u306f\u3001\u652f\u63f4\u6280\u8853\u304c\u7121\u8996\u3067\u304d\u308b\u3088\u3046\u306b\u753b\u50cf\u3092\u30de\u30fc\u30af\u30a2\u30c3\u30d7\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u3053\u3068\u3067\u3042\u308b\u3002\r\n>\r\n> title \u5c5e\u6027\u304c\u4f7f\u7528\u3055\u308c\u3066\u304a\u3089\u305a\u3001\u4ee3\u66ff\u30c6\u30ad\u30b9\u30c8\u304c\u7a7a\u306b\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u306a\u3089 (\u4f8b alt=\"\")\u3001\u305d\u308c\u306f\u753b\u50cf\u3092\u7121\u8996\u3057\u3066\u5dee\u3057\u652f\u3048\u306a\u3044\u3053\u3068\u3092\u652f\u63f4\u6280\u8853\u306b\u793a\u3057\u3066\u3044\u308b\u3002\r\n>\r\n> \u6ce8\u8a18: alt \u5c5e\u6027\u3092 \u300c\u7a7a\u300d\u306b\u3059\u308b\u306e\u3068\u3001alt \u5c5e\u6027\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u306f\u540c\u7fa9\u3067\u306f\u306a\u3044\u3002\r\n\r\nhttps:\/\/waic.jp\/translations\/WCAG-TECHS\/H67"}