{"id":13428,"date":"2026-07-13T13:29:48","date_gmt":"2026-07-13T04:29:48","guid":{"rendered":"https:\/\/code-plus.jp\/gp\/?p=13428"},"modified":"2026-07-14T01:03:50","modified_gmt":"2026-07-13T16:03:50","slug":"htmail-13428","status":"publish","type":"post","link":"https:\/\/code-plus.jp\/gp\/htmail-13428\/","title":{"rendered":"HTML\u30e1\u30fc\u30eb\u5236\u4f5c\u6642\u306e\u843d\u3068\u3057\u7a74 \u2014 Gmail\u30fbOutlook\u30fb\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3059\u3079\u3066\u306b\u5bfe\u5fdc\u3059\u308bHTML\u30e1\u30fc\u30eb\u306e\u4f5c\u308a\u65b9"},"content":{"rendered":"<p><b class=\"fw-600\">\u306f\u3058\u3081\u306b\uff1aHTML\u30e1\u30fc\u30eb\u306fWeb\u306e\u5e38\u8b58\u304c\u901a\u3058\u306a\u3044\u5225\u4e16\u754c<\/b><\/p>\r\n\r\n<p class=\"mt-1r\">Web\u30b5\u30a4\u30c8\u3068\u540c\u3058\u611f\u899a\u3067HTML\u30e1\u30fc\u30eb\u3092\u4f5c\u308b\u3068\u3001\u5fc5\u305a\u75db\u3044\u76ee\u306b\u906d\u3046\u3002<\/p>\r\n<ul style=\"list-style-type:bullet;\" class=\"my-0.5r\">\r\n  <li><code>flexbox<\/code>\u3001<code>grid<\/code>\u3001<code>position<\/code>\uff1a\u4f7f\u3048\u306a\u3044<\/li>\r\n  <li><code>&lt;head&gt;<\/code> \u306e <code>&lt;style&gt;<\/code>\uff1a\u7121\u8996\u3059\u308b\u30e1\u30fc\u30e9\u30fc\u304c\u3042\u308b<\/li>\r\n  <li><code>@media<\/code>\uff08\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u6642\u306e\u6307\u5b9a\uff09\uff1aGmail\u3067\u7121\u8996\u3055\u308c\u308b<\/li>\r\n  <li><code>&lt;!--&lsqb;if mso&rsqb;&gt;<\/code>\uff08Outlook\u7528\u6761\u4ef6\u5206\u5c90\uff09\uff1a\u5d29\u308c\u306e\u539f\u56e0\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308b<\/li>\r\n<\/ul>\r\n<p>\u4e00\u65b9\u3067\u3001<b class=\"fw-600\">\u4e00\u5ea6\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f5c\u3063\u3066\u3057\u307e\u3048\u3070\u4f7f\u3044\u56de\u3057\u304c\u3067\u304d\u308b<\/b>\u3002<br \/>\r\n  \u3053\u306e\u8a18\u4e8b\u306f\u3001\u5b9f\u6848\u4ef6\uff08\u30e1\u30eb\u30de\u30ac\uff09\u3092\u8907\u6570\u5236\u4f5c\u3059\u308b\u306a\u304b\u3067\u5f97\u305f\u77e5\u898b\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u3060\u3002<\/p>\r\n\r\n<!-- \u2756\u76ee\u6b21\u30ea\u30b9\u30c8 -->\r\n<ul class=\"tocList mt-3r\" data-toc-id=\"js-tocBWGD\" style=\"height:28rem\"><\/ul>\r\n<ins class=\"tocBtn is-fixed\" data-toc-id=\"js-tocBWGD\"><\/ins>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">1. CSS Reset\u306e\u30d9\u30fc\u30b9\u9078\u5b9a<\/h2>\r\n\r\n<p>Cerberus\u3001ZURB\u3001Benchmark Email\u3001Antwort\u3001ColorlibHQ \u306a\u3069<br class=\"d-none_sp\" \/>\u8907\u6570\u306eHTML\u30e1\u30fc\u30eb\u7528\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u8abf\u67fb\u3057\u305f\u7d50\u679c\u3001<b class=\"fw-600\">ColorlibHQ\uff08MIT\u30e9\u30a4\u30bb\u30f3\u30b9\uff09<\/b>\u3092\u30d9\u30fc\u30b9\u3068\u3057\u3066\u63a1\u7528\u3057\u305f\u3002\u7406\u7531\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u69cb\u9020\u3068\u3001\u4e3b\u8981\u306aGmail\u30cf\u30c3\u30af\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u70b9\u3002<\/p>\r\n\r\n<p>\u305f\u3060\u3057\u3001\u305d\u306e\u307e\u307e\u3067\u306f\u65e5\u672c\u8a9e\u5236\u4f5c\u74b0\u5883\u306b\u5408\u308f\u306a\u3044\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002<\/p>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">2. \u57fa\u672c\u65b9\u91dd\uff1a\u300c\u3069\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u3082\u5d29\u308c\u306a\u3044\u300d\u8a2d\u8a08<\/h2>\r\n\r\n<h3 class=\"fz-ml\">2-1. \u5e45\u306f <code>max-width: 680px \u301c 750px \u7a0b\u5ea6<\/code><\/h3>\r\n<p>\u7d4c\u9a13\u7684\u306b\u3001\u3053\u306e\u304f\u3089\u3044\u304cPC\u30e1\u30fc\u30e9\u30fc\u3068\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u826f\u3044\u3002<br \/>\r\n\uff08\u3042\u307e\u308a\u3001\u5e45\u304c\u5c0f\u3055\u3044\u3068PC\u30e1\u30fc\u30e9\u30fc\u3067\u5927\u304d\u304f\u8868\u793a\u3055\u308c\u308b\uff09<\/p>\r\n\r\n<pre><code class=\"language-html\">&lt;div style=\"max-width:680px; margin:0 auto;\" class=\"email-container\"&gt;\r\n  &lt;!-- \u30b3\u30f3\u30c6\u30f3\u30c4 --&gt;\r\n&lt;\/div&gt;<\/code><\/pre>\r\n\r\n<h3 class=\"fz-ml\">2-2. \u30ec\u30a4\u30a2\u30a6\u30c8\u306f <code>&lt;table&gt;<\/code> \u4e00\u629e<\/h3>\r\n<p>CSS\u306e <code>display:flex<\/code> \u3084 <code>display:grid<\/code> \u306fOutlook\u304c\u7121\u8996\u3059\u308b\u3002<br class=\"d-none_sp\" \/>\u30c6\u30fc\u30d6\u30eb\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u307f\u304c\u73fe\u72b6\u3082\u3063\u3068\u3082\u5b89\u5168\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;table width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\"&gt;\r\n  &lt;tr&gt;\r\n    &lt;td style=\"padding: 20px 5%;\"&gt;\r\n      &lt;!-- \u30b3\u30f3\u30c6\u30f3\u30c4 --&gt;\r\n    &lt;\/td&gt;\r\n  &lt;\/tr&gt;\r\n&lt;\/table&gt;<\/code><\/pre>\r\n<blockquote>\r\n  <p><b class=\"fw-600\">MSO\u6761\u4ef6\u5206\u5c90\uff08<code>&lt;!--&lsqb;if mso&rsqb;&gt;<\/code>\uff09\u306f\u4f7f\u308f\u306a\u3044<\/b><br>\u52b9\u304b\u306a\u3044\u30e1\u30fc\u30e9\u30fc\u304c\u591a\u304f\u3001\u5d29\u308c\u306e\u539f\u56e0\u306b\u306a\u308b\u30b1\u30fc\u30b9\u3082\u3042\u3063\u305f\u305f\u3081\u524a\u9664\u3057\u305f\u3002table\u69cb\u9020\u306b\u7d71\u4e00\u3057\u305f\u65b9\u304c\u7d50\u679c\u7684\u306b\u30b7\u30f3\u30d7\u30eb\u3067\u5b89\u5b9a\u3059\u308b\u3002<\/p>\r\n<\/blockquote>\r\n\r\n<h3 class=\"fz-ml\">2-3. \u30b9\u30bf\u30a4\u30eb\u306f\u3059\u3079\u3066\u30a4\u30f3\u30e9\u30a4\u30f3<\/h3>\r\n<p><code>&lt;head&gt;<\/code> \u306e <code>&lt;style&gt;<\/code> \u3092\u7121\u8996\u3059\u308b\u30e1\u30fc\u30e9\u30fc\u304c\u5b58\u5728\u3059\u308b\uff08\u4ee3\u8868\u4f8b\uff1a\u4e00\u90e8\u306eOutlook\u30fb\u65e7\u6765\u306eYahoo!\u30e1\u30fc\u30eb\uff09\u3002\u305d\u306e\u305f\u3081<b class=\"fw-600\">\u4e3b\u8981\u306a\u30b9\u30bf\u30a4\u30eb\u306f\u30a4\u30f3\u30e9\u30a4\u30f3\u3067<\/b>\u8a18\u8ff0\u3059\u308b\u3002<\/p>\r\n<blockquote>\r\n  <p><b class=\"fw-600\">CSS \u30af\u30e9\u30b9\u306f\u4fdd\u5b88\u7528\u3068\u3057\u3066\u8a18\u8ff0\u3057\u3066\u3082\u826f\u3044\u304c\u3001\u8868\u793a\u306f\u30a4\u30f3\u30e9\u30a4\u30f3\u306b\u4f9d\u5b58\u3055\u305b\u308b\u3002<\/b><\/p>\r\n<\/blockquote>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">3. \u4f7f\u3048\u308bHTML\u30bf\u30b0\u3068CSS<\/h2>\r\n\r\n<h3 class=\"fz-ml\">\u4f7f\u3048\u308b\u30bf\u30b0\uff08\u4e3b\u8981\u306a\u3082\u306e\uff09<\/h3>\r\n<pre><code class=\"language-\">table, tr, th, td\r\nimg\r\np, strong, small, span\r\nh1, h2, h3, h4, h5, h6\r\na, u, hr, br<\/code><\/pre>\r\n\r\n<h3 class=\"fz-ml\">\u4f7f\u3048\u308bCSS\u30d7\u30ed\u30d1\u30c6\u30a3\uff08\u30a4\u30f3\u30e9\u30a4\u30f3\u9650\u5b9a\uff09<\/h3>\r\n<pre><code class=\"language-\">background, background-color\r\nborder\uff08\u5404\u8fba\u6307\u5b9a\u542b\u3080\uff09\r\ncolor\r\ndisplay\r\nfont, font-family, font-size, font-style, font-weight\r\nheight, width\r\nletter-spacing, line-height\r\npadding\uff08\u5404\u8fba\u6307\u5b9a\u542b\u3080\uff09\r\ntable-layout\r\ntext-align, text-decoration, text-indent, text-transform\r\nvertical-align<\/code><\/pre>\r\n<p><code>position<\/code>\u3001<code>float<\/code>\u3001<code>flexbox<\/code>\u3001<code>grid<\/code> \u306f<b class=\"fw-600\">\u4f7f\u308f\u306a\u3044<\/b>\u3002<\/p>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">4. Gmail\u306e\u30af\u30bb\u306b\u5bfe\u3059\u308b\u30cf\u30c3\u30af\u96c6<\/h2>\r\n<p>ColorlibHQ\u306eCSS Reset\u306b\u542b\u307e\u308c\u308b\u4ee3\u8868\u7684\u306a\u30cf\u30c3\u30af\u3002\u306a\u305c\u5fc5\u8981\u306a\u306e\u304b\u3092\u7c21\u6f54\u306b\u307e\u3068\u3081\u308b\u3002<\/p>\r\n<pre><code class=\"language-css\">\/* \u2460 \u5927\u304d\u3044\u975e\u30ea\u30f3\u30af\u753b\u50cf\u306bGmail\u304c\u300c\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u300d\u30dc\u30bf\u30f3\u3092\u8868\u793a\u3059\u308b\u306e\u3092\u9632\u3050 *\/\r\n.a6S {\r\n  display: none !important;\r\n  opacity: 0.01 !important;\r\n}\r\n\r\n\/* \u2461 \u30b9\u30ec\u30c3\u30c9\u8868\u793a\u6642\u306bGmail\u304c\u30c6\u30ad\u30b9\u30c8\u30ab\u30e9\u30fc\u3092\u5909\u66f4\u3059\u308b\u306e\u3092\u9632\u3050 *\/\r\n.im {\r\n  color: inherit !important;\r\n}\r\n\r\n\/* \u2462 Gmail\u306eiOS\u30a2\u30d7\u30ea\u3067\u53f3\u306b\u4f59\u767d\u304c\u3067\u304d\u308b\u554f\u984c\u3092\u9632\u3050 *\/\r\n@media only screen and (min-device-width: 375px) and (max-device-width: 413px) {\r\n  u~div .email-container {\r\n    min-width: 375px !important;\r\n  }\r\n}\r\n\r\n\/* \u2463 Android 4.4\u3067\u4e0a\u4e0b\u306b\u4f59\u767d\u304c\u5165\u308b\u554f\u984c\u3092\u9632\u3050 *\/\r\ndiv&lsqb;style*=\"margin: 16px 0\"&rsqb; {\r\n  margin: 0 !important;\r\n}<\/code><\/pre>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">5. \u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u7b56<\/h2>\r\n<p><b class=\"fw-600\">Gmail\uff08iOS\/Android\uff09\u306f <code>@media (prefers-color-scheme: dark)<\/code> \u3092\u7121\u8996\u3059\u308b\u3002<\/b><\/p>\r\n<p>\u305d\u306e\u305f\u3081\u3001<code>@media<\/code> \u3067\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u6642\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u5207\u308a\u66ff\u3048\u308b\u30a2\u30d7\u30ed\u30fc\u30c1\u306f\u6a5f\u80fd\u3057\u306a\u3044\u74b0\u5883\u304c\u591a\u3044\u3002<br \/>\r\n  \u63a1\u7528\u3057\u305f\u65b9\u91dd\u306f\u300c<b class=\"fw-600\">\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306b\u5de6\u53f3\u3055\u308c\u306a\u3044\u30c7\u30b6\u30a4\u30f3\u3092\u4f5c\u308b<\/b>\u300d\u3053\u3068\u3002<\/p>\r\n\r\n<h3 class=\"fz-ml\">5-1. \u8584\u3044\u80cc\u666f\u8272\u306f <code>background-color<\/code> \u3067\u306f\u306a\u304f <code>background-image<\/code> \u3067\u8868\u73fe\u3059\u308b<\/h3>\r\n<p><code>background-color<\/code> \u306f\u30e1\u30fc\u30e9\u30fc\u306b\u3088\u3063\u3066<b class=\"fw-600\">\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u6642\u306b\u81ea\u52d5\u53cd\u8ee2<\/b>\u3055\u308c\u308b\uff08\u767d\u2192\u9ed2\u306a\u3069\uff09\u3002<br \/>\r\n  \u4e00\u65b9\u3001<b class=\"fw-600\">\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u306f\u30e1\u30fc\u30e9\u30fc\u304c\u53cd\u8ee2\u3057\u306a\u3044<\/b>\u3002<\/p>\r\n<p>\u2192 \u8584\u3044\u30af\u30ea\u30fc\u30e0\u8272\u306a\u3069\u306e\u80cc\u666f\u306f\u30011\u00d71px\u306e\u753b\u50cf\uff08\u307e\u305f\u306f\u5e2f\u72b6\u306e\u753b\u50cf\uff09\u3092 <code>background-image<\/code> \u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30e9\u30a4\u30c8\/\u30c0\u30fc\u30af\u4e21\u74b0\u5883\u3067\u56fa\u5b9a\u3067\u304d\u308b\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;td style=\"\r\n  background: #f8f8ff;\r\n  background-image: url(https:\/\/example.com\/bg-cream.png);\r\n  background-size: contain;\r\n\"&gt;<\/code><\/pre>\r\n\r\n<h3 class=\"fz-ml\">5-2. \u30b0\u30ec\u30fc\u306e\u30c6\u30ad\u30b9\u30c8\u306f <code>color:#888888<\/code> + <code>filter:brightness(52%)<\/code><\/h3>\r\n<p><code>color:#888888<\/code> \u306f<b class=\"fw-600\">16\u9032\u6570\u306e\u4e2d\u9593\u5024<\/b>\u3067\u3042\u308b\u305f\u3081\u3001\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u6642\u306e\u81ea\u52d5\u53cd\u8ee2\u306e\u5f71\u97ff\u3092\u53d7\u3051\u306b\u304f\u3044\uff08\u53cd\u8ee2\u3055\u308c\u3066\u3082 <code>#777777<\/code> \u76f8\u5f53\u3068\u5927\u304d\u304f\u5909\u308f\u3089\u306a\u3044\uff09\u3002<\/p>\r\n<p>\u305f\u3060\u3057 <code>#888888<\/code> \u5358\u4f53\u3067\u306f\u8584\u3059\u304e\u3066\u8aad\u307f\u306b\u304f\u3044\u305f\u3081\u3001<code>filter:brightness(52%)<\/code> \u3067\u5b9f\u8cea\u7684\u306b <code>#484848<\/code> \u76f8\u5f53\u306e\u6fc3\u3055\u307e\u3067\u5f15\u304d\u4e0b\u3052\u308b\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;small style=\"\r\n  color: #888888;\r\n  filter: brightness(52%);\r\n  display: block;\r\n  line-height: 1.44;\r\n  font-size: 85%;\r\n\"&gt;\r\n\u300c\u30b0\u30ea\u30fc\u30f3\u30b3\u30fc\u30c8\u6b66\u8535\u91ce\u300d\u304a\u304b\u3052\u3055\u307e\u3092\u3082\u3061\u307e\u3057\u3066\u3001\u6b8b\u308a5\u68df\u3068\u306a\u308a\u307e\u3057\u305f\u3002\r\n&lt;\/small&gt;<\/code><\/pre>\r\n<p>\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3088\u308a\u3001\u30e9\u30a4\u30c8\u30e2\u30fc\u30c9\/\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306e\u3069\u3061\u3089\u3067\u3082<b class=\"fw-600\">\u540c\u3058\u6fc3\u3055\u306e\u30b0\u30ec\u30fc\u30c6\u30ad\u30b9\u30c8\u304c\u8584\u3044\u80cc\u666f\u306e\u4e0a\u306b\u4e57\u308b<\/b>\u3002<\/p>\r\n\r\n<picture class=\"bd-bounds\"><img decoding=\"async\" src=\"https:\/\/code-plus.jp\/gp\/wp-content\/uploads\/SS-20260713-132407.png?ver=20260714010350\" alt=\"\" width=\"1001\" height=\"447\" class=\"alignnone size-full wp-image-13431\" \/><\/picture>\r\n<p>\uff08\u2191\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3067\u3082\u30b0\u30ec\u30fc\u30c6\u30ad\u30b9\u30c8\u304c\u8584\u3044\u80cc\u666f\u306e\u4e0a\u306b\u4e57\u3063\u3066\u3044\u308b\uff09<\/p>\r\n\r\n<br>\r\n<br>\r\n<blockquote>\r\n  <p><b class=\"fw-600\">\u88dc\u8db3\uff1a\u6fc3\u3044\u80cc\u666f\u8272\uff08\u30b0\u30ea\u30fc\u30f3\u3001\u30c0\u30fc\u30af\u30d6\u30eb\u30fc\u306a\u3069\uff09\u306e\u4e0a\u306b <code>color:#FFFFFF<\/code> \u306e\u30c6\u30ad\u30b9\u30c8\u3092\u7f6e\u304f\u5834\u5408\u306f\u3001\u3053\u306e\u30cf\u30c3\u30af\u306f\u4e0d\u8981\u3002<\/b><\/p>\r\n<\/blockquote>\r\n\r\n<picture class=\"bd-bounds my-1r\"><img decoding=\"async\" src=\"https:\/\/code-plus.jp\/gp\/wp-content\/uploads\/htmail-demo_2607131102_2_light.jpg?ver=20260714010350\" alt=\"\" width=\"1344\" height=\"329\" class=\"alignnone size-full wp-image-13436\" \/><\/picture>\r\n\r\n<picture class=\"bd-bounds mt-1r\"><img decoding=\"async\" src=\"https:\/\/code-plus.jp\/gp\/wp-content\/uploads\/htmail-demo_2607131102_2_dark.jpg?ver=20260714010350\" alt=\"\" width=\"1344\" height=\"329\" class=\"alignnone size-full wp-image-13437\" \/><\/picture>\r\n\r\n<p>\uff08\u2191\u6fc3\u3044\u80cc\u666f\u8272\u306e\u4e0a\u306b\u3001color:#FFFFFF \u306e\u30c6\u30ad\u30b9\u30c8\u3092\u7f6e\u304f\u5834\u5408\u306f\u53cd\u8ee2\u3055\u308c\u306a\u3044\uff09<\/p>\r\n\r\n\r\n\r\n\r\n<h3 class=\"fz-ml\">5-3. \u91cd\u8981\u306a\u60c5\u5831\u306f\u753b\u50cf\u3067\u8868\u73fe\u3059\u308b<\/h3>\r\n<p>\u30d8\u30c3\u30c0\u30fc\u306e\u30bf\u30a4\u30c8\u30eb\u3001\u4fa1\u683c\u3001\u30ad\u30e3\u30c3\u30c1\u30b3\u30d4\u30fc\u306a\u3069\u3001\u30c7\u30b6\u30a4\u30f3\u4e0a\u91cd\u8981\u306a\u60c5\u5831\u306f<b class=\"fw-600\">\u753b\u50cf\u306b\u3057\u3066\u3057\u307e\u3046<\/b>\u306e\u304c\u6700\u3082\u78ba\u5b9f\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;img\r\n  src=\"https:\/\/example.com\/headline.png\"\r\n  alt=\"\u5409\u7965\u5bfa\u99c5\u5f92\u6b6910\u5206&amp;#13;&amp;#10;\u7d9a\u3005\u3054\u6210\u7d04\u4e2d\uff01 \u6b8b\u308a5\u68df\"\r\n  style=\"width: 100%; display: block;\"\r\n\/&gt;<\/code><\/pre>\r\n\r\n<picture class=\"bd-bounds my-1r\"><img decoding=\"async\" src=\"https:\/\/code-plus.jp\/gp\/wp-content\/uploads\/SS-20260713-134203.png?ver=20260714010350\" alt=\"\" width=\"938\" height=\"353\" class=\"alignnone size-full wp-image-13439\" \/><\/picture>\r\n\r\n<picture class=\"bd-bounds mt-1r\"><img decoding=\"async\" src=\"https:\/\/code-plus.jp\/gp\/wp-content\/uploads\/SS-20260713-134211.jpg?ver=20260714010350\" alt=\"\" width=\"1133\" height=\"457\" class=\"alignnone size-full wp-image-13440\" \/><\/picture>\r\n<p>\uff08\u2191\u753b\u50cf\u3060\u3068\u9593\u9055\u3044\u306a\u3044\uff09<\/p>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">6. \u753b\u50cf\u304c\u8aad\u307f\u8fbc\u307e\u308c\u306a\u3044\u3068\u304d\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af<\/h2>\r\n<p>\u300c\u753b\u50cf\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b\u30e1\u30fc\u30e9\u30fc\u300d\u3084\u300c\u753b\u50cfOFF\u3067\u8aad\u3093\u3067\u3044\u308b\u53d7\u4fe1\u8005\u300d\u3078\u306e\u5bfe\u7b56\u3002<\/p>\r\n\r\n<h3 class=\"fz-ml\">6-1. <code>alt<\/code> \u306e\u30d5\u30a9\u30f3\u30c8\u30b9\u30bf\u30a4\u30eb\u306f <code>&lt;img&gt;<\/code> \u306e\u89aa\u8981\u7d20\u3067\u6307\u5b9a\u3059\u308b<\/h3>\r\n<p><code>&lt;img&gt;<\/code> \u81ea\u4f53\u3067\u306f\u306a\u304f\u3001\u305d\u306e<b class=\"fw-600\">\u89aa\u8981\u7d20\u306b\u30d5\u30a9\u30f3\u30c8\u30b9\u30bf\u30a4\u30eb\u3092\u6307\u5b9a\u3059\u308b<\/b>\u3068\u3001alt\u8868\u793a\u6642\u306b\u3082\u53cd\u6620\u3055\u308c\u308b\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;h1 style=\"font-size: 24px; font-weight: 700; text-align: center;\"&gt;\r\n  &lt;img\r\n    src=\"https:\/\/example.com\/title.png\"\r\n    alt=\"\u898b\u51fa\u3057\u30c6\u30ad\u30b9\u30c8\"\r\n    style=\"width: 100%; display: block;\"\r\n  \/&gt;\r\n&lt;\/h1&gt;<\/code><\/pre>\r\n\r\n<h3 class=\"fz-ml\">6-2. <code>alt<\/code> \u306e\u4e2d\u3067\u6539\u884c\u3059\u308b\uff08<code>&amp;#13;&amp;#10;<\/code>\uff09<\/h3>\r\n<pre><code class=\"language-html\">alt=\"1\u884c\u76ee\u306e\u30c6\u30ad\u30b9\u30c8&amp;#13;&amp;#10;2\u884c\u76ee\u306e\u30c6\u30ad\u30b9\u30c8\"<\/code><\/pre>\r\n\r\n<h3 class=\"fz-ml\">6-3. \u8aad\u307f\u8fbc\u307f\u5931\u6557\u6642\u306b\u4f59\u767d\u3092\u78ba\u4fdd\u3059\u308b\uff08<code>onerror<\/code>\uff09<\/h3>\r\n<p>\u753b\u50cf\u304c\u8868\u793a\u3055\u308c\u306a\u304b\u3063\u305f\u6642\u3001alt\u30c6\u30ad\u30b9\u30c8\u304c\u56db\u65b9\u306b\u8a70\u307e\u3063\u3066\u8aad\u307f\u306b\u304f\u304f\u306a\u308b\u306e\u3092\u9632\u3050\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;img\r\n  src=\"https:\/\/example.com\/image.png\"\r\n  alt=\"\u8aac\u660e\u30c6\u30ad\u30b9\u30c8\"\r\n  onerror=\"this.style.margin='15px auto';\"\r\n\/&gt;<\/code><\/pre>\r\n\r\n<picture class=\"bd-bounds my-1r\"><img decoding=\"async\" src=\"https:\/\/code-plus.jp\/gp\/wp-content\/uploads\/SS-20260713-134616.png?ver=20260714010350\" alt=\"\" width=\"881\" height=\"673\" class=\"alignnone size-full wp-image-13442\" \/><\/picture>\r\n<p>\uff08\u2191\u753b\u50cf\u304c\u8868\u793a\u3055\u308c\u306a\u3044\u5834\u5408\u3082\u3001\u30d5\u30a9\u30f3\u30c8\u30b9\u30bf\u30a4\u30eb\u30fb\u6539\u884c\u30fb\u4f59\u767d\u306f\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\uff09<\/p>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">7. \u5236\u4f5c\u4e0a\u306e\u6ce8\u610f\u70b9\u307e\u3068\u3081<\/h2>\r\n<table class=\"table my-0.5r\">\r\n  <thead>\r\n    <tr class=\"rung\">\r\n      <th>\u9805\u76ee<\/th>\r\n      <td>\u63a8\u5968<\/td>\r\n      <td>\u7406\u7531<\/td>\r\n    <\/tr>\r\n  <\/thead>\r\n  <tbody>\r\n    <tr class=\"rung\">\r\n      <th>\u5e45<\/th>\r\n      <td><code>max-width: 680px \u301c 750px \u7a0b\u5ea6<\/code><\/td>\r\n      <td>PC\u30e1\u30fc\u30e9\u30fc\u3068\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u826f\u3044<\/td>\r\n    <\/tr>\r\n    <tr class=\"rung\">\r\n      <th>\u30ec\u30a4\u30a2\u30a6\u30c8<\/th>\r\n      <td><code>&lt;table&gt;<\/code> \u7d71\u4e00<\/td>\r\n      <td>Outlook\u3067\u306e\u4e92\u63db\u6027<\/td>\r\n    <\/tr>\r\n    <tr class=\"rung\">\r\n      <th>\u30b9\u30bf\u30a4\u30eb<\/th>\r\n      <td>\u30a4\u30f3\u30e9\u30a4\u30f3\u306e\u307f<\/td>\r\n      <td><code>&lt;head&gt;<\/code>\u306eCSS\u3092\u7121\u8996\u3059\u308b\u30e1\u30fc\u30e9\u30fc\u304c\u3042\u308b<\/td>\r\n    <\/tr>\r\n    <tr class=\"rung\">\r\n      <th>\u80cc\u666f\u8272\uff08\u8584\u3044\u8272\uff09<\/th>\r\n      <td><code>background-image<\/code><\/td>\r\n      <td>\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3067\u53cd\u8ee2\u3055\u308c\u306a\u3044<\/td>\r\n    <\/tr>\r\n    <tr class=\"rung\">\r\n      <th>\u30b0\u30ec\u30fc\u30c6\u30ad\u30b9\u30c8<\/th>\r\n      <td><code>#888888<\/code> + <code>filter:brightness(52%)<\/code><\/td>\r\n      <td>\u30e9\u30a4\u30c8\/\u30c0\u30fc\u30af\u4e21\u5bfe\u5fdc<\/td>\r\n    <\/tr>\r\n    <tr class=\"rung\">\r\n      <th>\u91cd\u8981\u30b3\u30f3\u30c6\u30f3\u30c4<\/th>\r\n      <td>\u753b\u50cf\u5316<\/td>\r\n      <td>\u6700\u3082\u78ba\u5b9f\u306a\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u7b56<\/td>\r\n    <\/tr>\r\n    <tr class=\"rung\">\r\n      <th>\u753b\u50cf\u30d1\u30b9<\/th>\r\n      <td>\u7d76\u5bfe\u30d1\u30b9\uff08<code>https:\/\/<\/code>\uff09<\/td>\r\n      <td>\u76f8\u5bfe\u30d1\u30b9\u306f\u6dfb\u4ed8\u6271\u3044\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308b<\/td>\r\n    <\/tr>\r\n    <tr class=\"rung\">\r\n      <th>MSO\u6761\u4ef6\u5206\u5c90<\/th>\r\n      <td>\u4e0d\u4f7f\u7528<\/td>\r\n      <td>\u5d29\u308c\u306e\u539f\u56e0\u306b\u306a\u308b\u30b1\u30fc\u30b9\u304c\u3042\u308b<\/td>\r\n    <\/tr>\r\n  <\/tbody>\r\n<\/table>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">\u304a\u308f\u308a\u306b<\/h2>\r\n<p>HTML\u30e1\u30fc\u30eb\u306e\u96e3\u3057\u3055\u306f\u300c\u74b0\u5883\u3054\u3068\u306b\u6b63\u89e3\u304c\u9055\u3046\u300d\u70b9\u306b\u3042\u308b\u3002<code>@media<\/code> \u3067\u4e01\u5be7\u306b\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3082\u3001Gmail\u3067\u306f\u7121\u8996\u3055\u308c\u308b\u3002MSO\u6761\u4ef6\u5206\u5c90\u3067Outlook\u5bfe\u5fdc\u3057\u3066\u3082\u3001\u5225\u306e\u30e1\u30fc\u30e9\u30fc\u3067\u5d29\u308c\u308b\u3002<\/p>\r\n<p>\u305f\u3069\u308a\u7740\u3044\u305f\u65b9\u91dd\u306f\u300c<b class=\"fw-600\">CSS\u306b\u983c\u3089\u305a\u3001\u3069\u306e\u74b0\u5883\u3067\u3082\u540c\u3058\u3088\u3046\u306b\u898b\u3048\u308bHTML\u3092\u66f8\u304f<\/b>\u300d\u3053\u3068\u3002Web\u306e\u5e38\u8b58\u3092\u3044\u3063\u305f\u3093\u6368\u3066\u3066\u8a2d\u8a08\u3059\u308b\u3068\u89e3\u6c7a\u3059\u308b\u3002<\/p>\r\n\r\n<hr class=\"separator mt-3r\">\r\n\r\n<p><em>CSS Reset \u30d9\u30fc\u30b9\uff1a<cite><a href=\"https:\/\/github.com\/ColorlibHQ\/email-templates\" target=\"_blank\" class=\"link\">ColorlibHQ \/ Free Email Templates<\/a><\/cite>\uff08MIT License\uff09<\/em><\/p>","protected":false},"excerpt":{"rendered":"HTML\u30e1\u30fc\u30eb\u306fWeb\u30b5\u30a4\u30c8\u3068\u306f\u307e\u3063\u305f\u304f\u5225\u306e\u30eb\u30fc\u30eb\u3067\u52d5\u304f\u3002table\u5fc5\u9808\u30fb\u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u5fc5\u9808\u30fb@media\u306fGmail\u3067\u7121\u8996\u3055\u308c\u308b\u3002\u5b9f\u6848\u4ef6\u3067\u5f97\u305f\u300c\u3069\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u3082\u5d29\u308c\u306a\u3044\u300dHTML\u30e1\u30fc\u30eb\u306e\u8a2d\u8a08\u65b9\u91dd\u3068\u3001background-image\/filter:brightness\u3092\u4f7f\u3063\u305f\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u7b56\u3092\u5b9f\u88c5\u4f8b\u4ed8\u304d\u3067\u89e3\u8aac\u3002","protected":false},"author":1,"featured_media":13448,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"sns_share_botton_hide":"","vkExUnit_sns_title":"","_vk_print_noindex":"","footnotes":"","vk-ltc-link":"","vk-ltc-target":"0"},"categories":[11],"tags":[1037,1032,1033,1034,1035,1036,492,322,324,323],"class_list":["post-13428","post","type-post","status-publish","format-standard","has-post-thumbnail","category-html-css","tag-filter-brightness","tag-1032","tag-1033","tag-css","tag-table-","tag-phpmailer","tag-gmail","tag-html","tag-324","tag-outlook"],"veu_head_title_object":{"title":"","add_site_title":""},"_links":{"self":[{"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/posts\/13428","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/comments?post=13428"}],"version-history":[{"count":23,"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/posts\/13428\/revisions"}],"predecessor-version":[{"id":13467,"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/posts\/13428\/revisions\/13467"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/media\/13448"}],"wp:attachment":[{"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/media?parent=13428"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/categories?post=13428"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/code-plus.jp\/gp\/wp-json\/wp\/v2\/tags?post=13428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}