{"id":5287,"date":"2025-12-09T09:00:33","date_gmt":"2025-12-09T00:00:33","guid":{"rendered":"https:\/\/comcent.co.jp\/blog\/?p=5287"},"modified":"2025-11-04T00:57:16","modified_gmt":"2025-11-03T15:57:16","slug":"web-%e3%83%9a%e3%83%bc%e3%82%b8%e3%81%a7%e4%bb%bb%e6%84%8f%e3%81%ae%e9%83%a8%e5%88%86%e3%82%92%e5%85%a8%e7%94%bb%e9%9d%a2%e8%a1%a8%e7%a4%ba%e3%81%99%e3%82%8b%e3%80%80%e5%ae%9f%e8%b7%b5-fullscreen-api","status":"publish","type":"post","link":"https:\/\/comcent.co.jp\/blog\/archives\/5287\/","title":{"rendered":"Web \u30da\u30fc\u30b8\u3067\u4efb\u610f\u306e\u90e8\u5206\u3092\u5168\u753b\u9762\u8868\u793a\u3059\u308b\u3000\u5b9f\u8df5 Fullscreen API"},"content":{"rendered":"\n<p>\u8ab0\u304c\u6c7a\u3081\u305f\u8a33\u3067\u3082\u306a\u3044\u306f\u305a\u306a\u306e\u3067\u3059\u304c\u3001 \u5927\u62b5\u306eWeb\u30d6\u30e9\u30a6\u30b6\u306f\u30a2\u30c9\u30ec\u30b9\u30d0\u30fc\u3068\u30bf\u30d6\u304c\u753b\u9762\u7aef\u306b\u3042\u3063\u3066\u3001\u305d\u308c\u4ee5\u5916\u306fWeb\u30b5\u30a4\u30c8\u3092\u8868\u793a\u3059\u308b\u90e8\u5206\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u8868\u793a\u30c7\u30d0\u30a4\u30b9\u306b\u3082\u3088\u308a\u307e\u3059\u304c\u3001\u5927\u4f53 \u753b\u9762\u306e80%\u4ee5\u4e0a\u306fWeb\u30b5\u30a4\u30c8\u3092\u8868\u793a\u3059\u308b\u90e8\u5206\u306b\u4f7f\u308f\u308c\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u591a\u304f\u306eWeb\u30b5\u30a4\u30c8\u306f\u305d\u308c\u3067\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u304c\u3001 \u30b2\u30fc\u30e0\u3084\u52d5\u753b\u306a\u3069\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3059\u308b\u5834\u5408\u3001 \u306a\u308b\u3079\u304f\u4f59\u8a08\u306a\u3082\u306e\u306f\u8868\u793a\u305b\u305a\u306b\u3001\u753b\u9762\u5168\u4f53\u3092\u30b5\u30a4\u30c8\u306e\u8868\u793a\u306b\u5272\u304d\u305f\u3044\u30b1\u30fc\u30b9\u3082\u3042\u308b\u3067\u3057\u3087\u3046\u3002<br>\u5177\u4f53\u7684\u306a\u4f8b\u3068\u3057\u3066\u3001\u30d6\u30ed\u30b0\u8a18\u4e8b\u306a\u3069\u306b\u57cb\u3081\u8fbc\u307e\u308c\u3066\u3044\u308bYouTube\u3092\u898b\u308b\u5834\u5408\u306b\u3001\u5168\u753b\u9762\u8868\u793a\u3092\u3057\u3066\u898b\u305f\u3053\u3068\u304c\u3042\u308b\u4eba\u3082\u591a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n<p>\u3042\u306e\u5168\u753b\u9762\u8868\u793a\u306f\u52d5\u753b\u3084\u30d9\u30fc\u30e0\u306a\u3069\u306e\u30e1\u30c7\u30a3\u30a2\u3060\u3051\u306b\u8a31\u3055\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u539f\u5247\u3001Web\u30da\u30fc\u30b8\u306bHTML + CSS\u3067\u8868\u793a\u3067\u304d\u308b\u3082\u306e\u306f\u5168\u3066\u5168\u753b\u9762\u8868\u793a\u306b\u3067\u304d\u307e\u3059\u3002<br>\u5b9f\u969b\u306b\u5168\u753b\u9762\u8868\u793a\u3092\u884c\u3046\u305f\u3081\u306bJavaScript\u304b\u3089\u7528\u3044\u308bAPI\u304cFullscreen API\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u5168\u753b\u9762Fullscreen API\u3092\u7528\u3044\u3066\u958b\u767a\u3092\u3059\u308b\u3068\u304d\u306e\u6ce8\u610f\u70b9\u3084\u3001\u5b9f\u969b\u306b\u5168\u753b\u9762\u8868\u793a\u3092\u884c\u3046\u305f\u3081\u306e\u30b3\u30fc\u30c9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"684\" loading=\"lazy\" src=\"https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0003-1024x684.png\" alt=\"\" class=\"wp-image-5315\" srcset=\"https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0003-1024x684.png 1024w, https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0003-300x201.png 300w, https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0003-768x513.png 768w, https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0003.png 1496w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-comcent-blog-headline01 modHeadline\">\u5b9f\u969b\u306b\u8a66\u3057\u3066\u307f\u308b<\/h4>\n\n\n\n<p>\u4ee5\u4e0b\u306f\u5b9f\u969b\u306bFullscreen API\u3092\u7528\u3044\u3066\u5168\u753b\u9762\u8868\u793a\u3092\u884c\u3046\u305f\u3081\u306e\u30dc\u30bf\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<style>\n  #request-fullscreen-button {\n    display: block;\n    margin: 10px;\n    padding: 10px;\n    background-color: #007bff;\n    color: white;\n    border: none;\n    border-radius: 5px;\n    cursor: pointer;\n  }\n  #exit-fullscreen-button {\n    display: none;\n    margin: 10px;\n    padding: 10px;\n    background-color: #dc3545;\n    color: white;\n    border: none;\n    border-radius: 5px;\n    cursor: pointer;\n  }\n  html:fullscreen #request-fullscreen-button {\n    display: none;\n  }\n  html:fullscreen #exit-fullscreen-button {\n    display: block;\n  }\n<\/style>\n<button id=\"request-fullscreen-button\">\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b<\/button>\n<button id=\"exit-fullscreen-button\">\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b<\/button>\n<script>\n  document.addEventListener('DOMContentLoaded', () => {\n    \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b\n    document.getElementById('request-fullscreen-button').addEventListener('click', () => {\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\n      if (!document.documentElement.requestFullscreen) {\n        alert('\u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002');\n        return;\n      }\n\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b\n      document.documentElement.requestFullscreen().catch(error => {\n        alert(`\u5168\u753b\u9762\u8868\u793a\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n      });\n    });\n\n    \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\n    document.getElementById('exit-fullscreen-button').addEventListener('click', () => {\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\n      if (!document.exitFullscreen) {\n        alert('\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u8981\u7d20\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002');\n        return;\n      }\n\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\n      document.exitFullscreen().catch(error => {\n        alert(`\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u306e\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n      });\n    });\n  });\n\n    \/\/ \u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u3092\u76e3\u8996\u3057\u3001\u30ed\u30b0\u3068\u3057\u3066\u51fa\u529b\n  document.addEventListener('fullscreenchange', () => {\n    console.log(`\u5168\u753b\u9762\u30e2\u30fc\u30c9\u3092: ${document.fullscreenElement ? '\u958b\u59cb\u3057\u307e\u3057\u305f' : '\u7d42\u4e86\u3057\u307e\u3057\u305f'}`);\n  });\n<\/script>\n\n\n\n<p>\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u3066\u307f\u308b\u3068\u8a18\u4e8b\u90e8\u5206\u3060\u3051\u304c\u5168\u753b\u9762\u306b\u306a\u3063\u305f\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n\n\n\n<p>\u30dc\u30bf\u30f3\u5468\u308a\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code modBlobCode\"><code>&lt;style&gt;\n  #request-fullscreen-button {\n    display: block;\n    margin: 10px;\n    padding: 10px;\n    background-color: #007bff;\n    color: white;\n    border: none;\n    border-radius: 5px;\n    cursor: pointer;\n  }\n  #exit-fullscreen-button {\n    display: none;\n    margin: 10px;\n    padding: 10px;\n    background-color: #dc3545;\n    color: white;\n    border: none;\n    border-radius: 5px;\n    cursor: pointer;\n  }\n  html:fullscreen #request-fullscreen-button {\n    display: none;\n  }\n  html:fullscreen #exit-fullscreen-button {\n    display: block;\n  }\n&lt;\/style&gt;\n&lt;button id=\"request-fullscreen-button\"&gt;\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b&lt;\/button&gt;\n&lt;button id=\"exit-fullscreen-button\"&gt;\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b&lt;\/button&gt;\n&lt;script&gt;\n  document.addEventListener('DOMContentLoaded', () =&gt; {\n    \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b\n    document.getElementById('request-fullscreen-button').addEventListener('click', () =&gt; {\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\n      if (!document.documentElement.requestFullscreen) {\n        alert('\u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002');\n        return;\n      }\n\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b\n      document.documentElement.requestFullscreen().catch(error =&gt; {\n        alert(`\u5168\u753b\u9762\u8868\u793a\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n      });\n    });\n\n    \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\n    document.getElementById('exit-fullscreen-button').addEventListener('click', () =&gt; {\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\n      if (!document.exitFullscreen) {\n        alert('\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u8981\u7d20\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002');\n        return;\n      }\n\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\n      document.exitFullscreen().catch(error =&gt; {\n        alert(`\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u306e\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n      });\n    });\n  });\n\n    \/\/ \u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u3092\u76e3\u8996\u3057\u3001\u30ed\u30b0\u3068\u3057\u3066\u51fa\u529b\n  document.addEventListener('fullscreenchange', () =&gt; {\n    console.log(`\u5168\u753b\u9762\u30e2\u30fc\u30c9\u3092: ${document.fullscreenElement ? '\u958b\u59cb\u3057\u307e\u3057\u305f' : '\u7d42\u4e86\u3057\u307e\u3057\u305f'}`);\n  });\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u305f\u3044\u3053\u3068\u306f\u3060\u3044\u305f\u3044\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-comcent-blog-headline01 modHeadline\">\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b<\/h4>\n\n\n\n<p>\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b\u305f\u3081\u306b\u306f\u3001<code>Element.requestFullscreen()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code modBlobCode\"><code>document.documentElement.requestFullscreen();<\/code><\/pre>\n\n\n\n<p>\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306fElement\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u3064\u307e\u308a\u3001<code>document.documentElement<\/code>\u3060\u3051\u3067\u306a\u304f\u3001\u4efb\u610f\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3088\u308a\u5e73\u305f\u304f\u8a00\u3048\u3070<code>document.getElementById()<\/code>\u3084<code>document.querySelector()<\/code>\u3067\u53d6\u5f97\u3057\u305f\u8981\u7d20\u306b\u5bfe\u3057\u3066\u3082\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3061\u306a\u307f\u306b\u3001\u30e6\u30fc\u30b6\u30fc\u8a2d\u5b9a\u306a\u3069\u306b\u3088\u3063\u3066\u306f\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u306fError\u304cthrow\u3055\u308c\u308b\u306e\u3067\u3001\u4e01\u5be7\u306bcatch\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><img loading=\"lazy\"><code>document.documentElement.requestFullscreen().catch(error =&gt; {\n  alert(`\u5168\u753b\u9762\u8868\u793a\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n});\n<\/code><\/pre>\n\n\n\n<p>\u7279\u306b\u8907\u96d1\u306a\u51e6\u7406\u304c\u5fc5\u8981\u306a\u3044\u5834\u5408\u306f\u4e0a\u8a18\u306e\u3088\u3046\u306b\u76f4\u63a5<code>.catch()<\/code>\u3092\u4f7f\u7528\u3059\u308c\u3070\u826f\u3044\u306e\u3067\u3059\u304c\u3001\u5b9f\u306f<code>Element.requestFullscreen()<\/code>\u30e1\u30bd\u30c3\u30c9\u306f Promise \u3092\u8fd4\u3059\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b<code>then()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u30d5\u30eb\u30b9\u30af\u30ea\u30fc\u30f3\u958b\u59cb\u6210\u529f\u6642\u306e\u51e6\u7406\u3082\u66f8\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><img loading=\"lazy\"><code>document.documentElement.requestFullscreen().then(() =&gt; {\n  console.log('\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3057\u307e\u3057\u305f');\n}).catch(error =&gt; {\n  alert(`\u5168\u753b\u9762\u8868\u793a\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n});\n<\/code><\/pre>\n\n\n\n<p>Promise\u306a\u306e\u3067\u3001<code>async<\/code>\u00a0\/\u00a0<code>await<\/code>\u3092\u4f7f\u7528\u3057\u3066\u66f8\u304f\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><img loading=\"lazy\"><code>(async () =&gt; {\n  try {\n    await document.documentElement.requestFullscreen();\n    console.log('\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3057\u307e\u3057\u305f');\n  } catch (error) {\n    alert(`\u5168\u753b\u9762\u8868\u793a\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n  }\n})();<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-comcent-blog-headline02 modMiddleHeading\">\u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"684\" loading=\"lazy\" src=\"https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0001-1024x684.png\" alt=\"\" class=\"wp-image-5313\" srcset=\"https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0001-1024x684.png 1024w, https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0001-300x201.png 300w, https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0001-768x513.png 768w, https:\/\/comcent.co.jp\/blog\/wp-content\/uploads\/2025\/04\/noji-2025-04-01-blog-0001.png 1496w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u5927\u4f53\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308bFullscreen API\u3067\u3059\u304c\u3001\u5168\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u52d5\u4f5c\u3057\u306a\u3044\u74b0\u5883\u3068\u3057\u3066\u6700\u3082\u4ee3\u8868\u7684\u306a\u306e\u306fiPhone\u4e0a\u3067\u52d5\u4f5c\u3059\u308bSafari\u3084Chrome,\u00a0Firefox\u306a\u3069\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u3059(macOS\u3084iPad\u306eSafari\u3067\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3088\u3046\u3067\u3059)\u3002<\/p>\n\n\n\n<p>\u4e8b\u524d\u306bFullscreen API\u304c\u4f7f\u7528\u3067\u304d\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304a\u3044\u305f\u65b9\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002\u4eee\u306bFullscreen API\u672a\u5bfe\u5fdc\u306e\u30d6\u30e9\u30a6\u30b6\u3067<code>requestFullscreen();<\/code>\u3092\u547c\u3073\u51fa\u305d\u3046\u3068\u3057\u305f\u5834\u5408\u306fError\u304cthrow\u3055\u308c\u308b\u306e\u3067\u3001\u5f8c\u7d9a\u306eJavaScript\u30b3\u30fc\u30c9\u306b\u60aa\u5f71\u97ff\u3092\u53ca\u307c\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><img loading=\"lazy\"><code>if (!document.documentElement.requestFullscreen) {\n  alert('\u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002');\n  return;\n}\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u3001<code>requestFullscreen<\/code>\u30e1\u30bd\u30c3\u30c9\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306b\u30a2\u30e9\u30fc\u30c8\u3092\u8868\u793a\u3057\u3066\u51e6\u7406\u3092\u4e2d\u65ad\u3059\u308b\u30b3\u30fc\u30c9\u3067\u3059\u3002Fullscreen API\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u30d6\u30e9\u30a6\u30b6\u306e\u5834\u5408\u3001<code>document.documentElement.requestFullscreen<\/code>\u306f<code>undefined<\/code>\u306b\u306a\u308b\u306e\u3067\u3001<code>if (!document.documentElement.requestFullscreen)<\/code>\u306e\u6761\u4ef6\u5f0f\u304c\u771f\u306b\u306a\u308a\u3001\u30a2\u30e9\u30fc\u30c8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306b\u3001\u5b9f\u969b\u306bFullscreen API\u306e\u5bfe\u5fdc\u53ef\u5426\u3092\u5224\u5b9a\u30fb\u8868\u793a\u3059\u308b\u6a5f\u80fd\u3092\u7528\u610f\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p style=\"color:orange;font-size:18px;\">\u3042\u306a\u305f\u306e\u30d6\u30e9\u30a6\u30b6\u306f Fullscreen API \u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e<span id=\"check-fullscreen-result\"><\/span><\/p>\n<script>\n  document.addEventListener('DOMContentLoaded', () => {\n    document.getElementById('check-fullscreen-result').textContent = document.documentElement.requestFullscreen ? '\u3059' : '\u305b\u3093';\n  });\n<\/script>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\">&lt;p style=\"color:orange;font-size:18px;\"&gt;\u3042\u306a\u305f\u306e\u30d6\u30e9\u30a6\u30b6\u306f Fullscreen API \u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e&lt;span id=\"check-fullscreen-result\"&gt;&lt;\/span&gt;&lt;\/p&gt;<code><br>&lt;script&gt;<br>  document.addEventListener('DOMContentLoaded', () =&gt; {<br>    document.getElementById('check-fullscreen-result').textContent = document.documentElement.requestFullscreen ? '\u3059' : '\u305b\u3093';<br>  });<\/code><br>&lt;\/script&gt;<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u3042\u308b\u7279\u5b9a\u306e\u8981\u7d20\u3092\u5168\u753b\u9762\u8868\u793a\u3059\u308b\">\u3042\u308b\u7279\u5b9a\u306e\u8981\u7d20\u3092\u5168\u753b\u9762\u8868\u793a\u3059\u308b<\/h3>\n\n\n\n<p>\u5148\u8ff0\u306e\u30b3\u30fc\u30c9\u306f<code>document.documentElement<\/code>\u306b\u5bfe\u3057\u3066<code>requestFullscreen()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u308b\u306e\u3067\u3001<code>document.documentElement<\/code>\u304c\u6307\u3059 HTML \u8981\u7d20\u304c\u5168\u753b\u9762\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ed6\u65b9\u3001<code>requestFullscreen()<\/code>\u30e1\u30bd\u30c3\u30c9\u306f<code>document.documentElement<\/code>\u3060\u3051\u3067\u306f\u306a\u304f<code>Element<\/code>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u306a\u306e\u3067\u3001\u4efb\u610f\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u8d64\u3044\u30dc\u30c3\u30af\u30b9\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u8d64\u3044\u30dc\u30c3\u30af\u30b9\u3060\u3051\u304c\u5168\u753b\u9762\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<style>\n  #fullscreen-target {\n    width: 250px;\n    height: 100px;\n    background-color: red;\n  }\n<\/style>\n<div id=\"fullscreen-target\">\n  <p>\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u5168\u753b\u9762\u8868\u793a\u3092\u30c8\u30b0\u30eb\u3057\u307e\u3059<\/p>\n<\/div>\n<script>\n  document.addEventListener('DOMContentLoaded', () => {\n    \/\/ \u5168\u753b\u9762\u8868\u793a\u306e\u5bfe\u8c61\n    const target = document.getElementById('fullscreen-target');\n    \n    target.addEventListener('click', () => {\n        \/\/ \u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\n      if (!target.requestFullscreen) {\n        alert('\u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002');\n        return;\n      }\n\n      \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\n      if (document.fullscreenElement) {\n        document.exitFullscreen().catch(error => {\n          alert(`\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u306e\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n        });\n      } \n      \n      \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b\n      else {\n        target.requestFullscreen().catch(error => {\n          alert(`\u5168\u753b\u9762\u8868\u793a\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);\n        });\n      }\n    });\n  });\n<\/script>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><code>&lt;style&gt;<br>  #fullscreen-target {<br>    width: 250px;<br>    height: 100px;<br>    background-color: red;<br>  }<br>&lt;\/style&gt;<br>&lt;div id=\"fullscreen-target\"&gt;<br>  &lt;p&gt;\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u5168\u753b\u9762\u8868\u793a\u3092\u30c8\u30b0\u30eb\u3057\u307e\u3059&lt;\/p&gt;<br>&lt;\/div&gt;<br>&lt;script&gt;<br>  document.addEventListener('DOMContentLoaded', () =&gt; {<br>    \/\/ \u5168\u753b\u9762\u8868\u793a\u306e\u5bfe\u8c61<br>    const target = document.getElementById('fullscreen-target');<br>    <br>    target.addEventListener('click', () =&gt; {<br>        \/\/ \u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af<br>      if (!target.requestFullscreen) {<br>        alert('\u5168\u753b\u9762\u8868\u793a\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002');<br>        return;<br>      }<br><br>      \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b<br>      if (document.fullscreenElement) {<br>        document.exitFullscreen().catch(error =&gt; {<br>          alert(`\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u306e\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);<br>        });<br>      } <br>      <br>      \/\/ \u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3059\u308b<br>      else {<br>        target.requestFullscreen().catch(error =&gt; {<br>          alert(`\u5168\u753b\u9762\u8868\u793a\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);<br>        });<br>      }<br>    });<br>  });<br>&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<p>\u304a\u305d\u3089\u304f\u3001\u8d64\u3044\u30dc\u30c3\u30af\u30b9\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u8d64\u3044\u30dc\u30c3\u30af\u30b9\u304c\u753b\u9762\u3044\u3063\u3071\u3044\u306b\u8868\u793a\u3055\u308c\u305f\u304b\u3068\u601d\u3044\u307e\u3059\u3002<br>\u3053\u3053\u3067\u6ce8\u76ee\u3059\u3079\u304d\u306f\u3001\u8d64\u3044\u30dc\u30c3\u30af\u30b9\u306f\u5168\u753b\u9762\u8868\u793a\u72b6\u614b\u306b\u306a\u308b\u524d\u306fwidth: 250px; height: 100px;\u306e\u30b5\u30a4\u30ba\u3067\u8868\u793a\u3055\u308c\u3066\u3044\u305f\u306e\u306b\u3001\u5168\u753b\u9762\u8868\u793a\u72b6\u614b\u306b\u306a\u308b\u3068\u753b\u9762\u3044\u3063\u3071\u3044\u306b\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u3067\u3059\u3002<br>\u3053\u308c\u306f\u3001\u5168\u753b\u9762\u8868\u793a\u72b6\u614b\u306b\u306a\u308b\u3068\u3001\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3057\u305f\u8981\u7d20\u306eCSS\u30b9\u30bf\u30a4\u30eb\u304c\u30d6\u30e9\u30a6\u30b6\u306b\u3088\u3063\u3066\u4e0a\u66f8\u304d\u3055\u308c\u308b\u305f\u3081\u3067\u3059\u3002<br>\u5b9f\u969b\u306bChrome\u306eDevTools\u3067\u78ba\u8a8d\u3057\u3066\u307f\u308b\u3068\u4ee5\u4e0b\u306e\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3067\u4e0a\u66f8\u304d\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code modBlobCode\"><code>:not(:root):fullscreen {\n    object-fit: contain;\n    user-select: text;\n    position: fixed !important;\n    box-sizing: border-box !important;\n    min-width: 0px !important;\n    max-width: none !important;\n    min-height: 0px !important;\n    max-height: none !important;\n    width: 100% !important;\n    height: 100% !important;\n    transform: none !important;\n    inset: 0px !important;\n    margin: 0px !important;\n}<\/code><\/pre>\n\n\n\n<p><br>\u7b46\u8005\u304c\u78ba\u8a8d\u3057\u305f\u9650\u308a\u3067\u306f\u3001\u5c11\u306a\u304f\u3068\u3082Windows\u306eChrome, Firefox, Edge, macOS\u306eSafari\u3067\u306fwidth\u3068height\u304c\u753b\u9762\u3044\u3063\u3071\u3044\u306b\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u4e0a\u66f8\u304d\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002<br>\u3057\u304b\u3057\u30d6\u30e9\u30a6\u30b6\u306b\u3088\u3063\u3066\u306f\u3001\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3057\u305f\u8981\u7d20\u306eCSS\u30b9\u30bf\u30a4\u30eb\u304c\u4e0a\u66f8\u304d\u3055\u308c\u306a\u3044\u5834\u5408\u3082\u3042\u308b\u3088\u3046\u3067\u3059\u3002<br>\u305d\u306e\u3088\u3046\u306a\u30d6\u30e9\u30a6\u30b6\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u5834\u5408\u306f\u3001\u8868\u793a\u3092\u7d71\u4e00\u3059\u308b\u305f\u3081\u3001\u5f8c\u8ff0\u306e<code>:fullscreen<\/code>\u64ec\u4f3c\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5168\u753b\u9762\u8868\u793a\u6642\u306eCSS\u30b9\u30bf\u30a4\u30eb\u3092\u4e0a\u66f8\u304d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br><br>\u307e\u305f\u5168\u753b\u9762\u8868\u793a\u6642\u306f\u3001\u6307\u5b9a\u3057\u305f\u8981\u7d20\u306b\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u8981\u7d20\u306f\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u3002\u4f8b\u3048position: fixed;\u3067\u56fa\u5b9a\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u8981\u7d20\u3067\u3082\u3001\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3057\u305f\u8981\u7d20\u306b\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-comcent-blog-headline01 modHeadline\">\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b<\/h4>\n\n\n\n<p>\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u305f\u3081\u306b\u306f\u3001<code>document.exitFullscreen()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><code>document.exitFullscreen();<\/code><\/pre>\n\n\n\n<p>\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f<code>document<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3057\u305f\u8981\u7d20\u306b\u5bfe\u3057\u3066\u547c\u3073\u51fa\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u73fe\u5728\u306a\u306b\u304c\u5168\u753b\u9762\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u306e\u304b\u3092\u77e5\u3089\u306a\u304f\u3066\u3082\u4f7f\u3048\u308b\u3068\u8003\u3048\u308c\u3070\u90fd\u5408\u306e\u826f\u3044\u4ed5\u69d8\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p><code>requestFullscreen()<\/code>\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u69d8\u306b\u4e8b\u524d\u306bFullscreen API\u304c\u4f7f\u7528\u3067\u304d\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304a\u3044\u305f\u65b9\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002\u4eee\u306bFullscreen API\u672a\u5bfe\u5fdc\u306e\u30d6\u30e9\u30a6\u30b6\u3067<code>exitFullscreen();<\/code>\u3092\u547c\u3073\u51fa\u305d\u3046\u3068\u3057\u305f\u5834\u5408\u306fError\u304cthrow\u3055\u308c\u308b\u306e\u3067\u3001\u5f8c\u7d9a\u306eJavaScript\u30b3\u30fc\u30c9\u306b\u60aa\u5f71\u97ff\u3092\u53ca\u307c\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><img loading=\"lazy\"><code>if (!document.exitFullscreen) {\n  alert('\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u8981\u7d20\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002');\n  return;\n}\n<\/code><\/pre>\n\n\n\n<p>\u540c\u69d8\u306b\u3001\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u306fError\u304cthrow\u3055\u308c\u308b\u306e\u3067\u3001\u4e01\u5be7\u306bcatch\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><code>document.exitFullscreen().catch(error =&gt; {<br>  alert(`\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u306e\u306b\u5931\u6557\u3057\u307e\u3057\u305f: ${error.message}`);<br>});<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-comcent-blog-headline02 modMiddleHeading\">\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u983c\u3089\u305a\u5168\u753b\u9762\u3092\u7d42\u4e86\u3059\u308b<\/h4>\n\n\n\n<p>JavaScript\u306b\u3088\u3063\u3066\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u305f\u3081\u306b\u306f\u3001<code>document.exitFullscreen()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30d6\u30e9\u30a6\u30b6\u306eUI\u3092\u64cd\u4f5c\u3057\u3066\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u9006\u306b\u8a00\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u3053\u3068\u3092JavaScript\u304b\u3089\u963b\u6b62\u3059\u308b\u3053\u3068\u306f\u4e0d\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5927\u62b5\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u5168\u753b\u9762\u8868\u793a\u304c\u958b\u59cb\u3055\u308c\u305f\u5834\u5408\u3001\u30d6\u30e9\u30a6\u30b6\u304b\u3089\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u3092\u8aac\u660e\u3059\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u00a0\u3053\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3082JavaScript\u3084CSS\u3092\u4f7f\u7528\u3057\u3066\u975e\u8868\u793a\u306b\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093(\u30e6\u30fc\u30b6\u30fc\u304c\u81ea\u8eab\u3067\u30d6\u30e9\u30a6\u30b6\u306e\u8a2d\u5b9a\u3092\u5909\u66f4or\u30e6\u30fc\u30b6\u30fc\u5b9a\u7fa9\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3092\u5909\u66f4\u3059\u308b\u306a\u3069\u3059\u308c\u3070\u53ef\u80fd\u3067\u3059)\u3002<\/p>\n\n\n\n<p>PC\u30d6\u30e9\u30a6\u30b6\u3067\u3042\u308c\u3070\u3001Esc\u30ad\u30fc\u3084F11\u30ad\u30fc\u3092\u62bc\u3059\u3053\u3068\u3067\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-comcent-blog-headline01 modHeadline\">\u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u3092\u76e3\u8996\u3059\u308b<\/h4>\n\n\n\n<p>\u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u3092\u76e3\u8996\u3059\u308b\u305f\u3081\u306b\u306f\u3001<code>fullscreenchange<\/code>\u30a4\u30d9\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><img loading=\"lazy\"><code>document.addEventListener('fullscreenchange', () =&gt; {\n  console.log(`\u5168\u753b\u9762\u30e2\u30fc\u30c9\u3092: ${document.fullscreenElement ? '\u958b\u59cb\u3057\u307e\u3057\u305f' : '\u7d42\u4e86\u3057\u307e\u3057\u305f'}`);\n});\n<\/code><\/pre>\n\n\n\n<p><code>fullscreenchange<\/code>\u30a4\u30d9\u30f3\u30c8\u306f\u5b9f\u969b\u306b\u5168\u753b\u9762\u8868\u793a\u306e\u5bfe\u8c61\u306b\u306a\u3063\u3066\u3044\u308b<code>Element<\/code>\u3067\u306f\u306a\u304f\u3001<code>document<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u767a\u706b\u3057\u307e\u3059\u3002\u5168\u753b\u9762\u8868\u793a\u3092\u958b\u59cb\u3057\u305f or \u7d42\u4e86\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u4f55\u304b\u3057\u305f\u3044\u5834\u5408\u306f\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u4ed6\u65b9\u3001<code>document.fullscreenElement<\/code>\u3092\u8abf\u3079\u308c\u3070\u5168\u753b\u9762\u8868\u793a\u306e\u5bfe\u8c61\u3068\u306a\u3063\u3066\u3044\u308b\u8981\u7d20\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u00a0\u5168\u753b\u9762\u8868\u793a\u72b6\u614b\u3067\u306a\u3044\u5834\u5408\u306f<code>null<\/code>\u304c\u8fd4\u3063\u3066\u304f\u308b\u306e\u3067\u3001\u73fe\u5728\u5168\u753b\u9762\u72b6\u614b\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u306e\u5224\u5b9a\u306b\u3082\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-comcent-blog-headline02 modMiddleHeading\">\u81ea\u524d\u306e\u30d5\u30e9\u30b0\u3067\u5168\u753b\u9762\u72b6\u614b\u3092\u7ba1\u7406\u3057\u306a\u3044\u307b\u3046\u304c\u826f\u3044<\/h4>\n\n\n\n<p><code>document.fullscreenElement<\/code>\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u3092\u81ea\u524d\u306e\u30d5\u30e9\u30b0\u3067\u7ba1\u7406\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u30d5\u30eb\u30b9\u30af\u30ea\u30fc\u30f3\u306e\u958b\u59cb\u51e6\u7406&nbsp;&amp;&nbsp;\u7d42\u4e86\u51e6\u7406\u306b\u81ea\u524d\u306e\u30d5\u30e9\u30b0\u306e on\/off \u3092\u8ffd\u52a0\u3059\u308c\u3070\u30d5\u30e9\u30b0\u3092\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u305d\u3046\u3067\u3059\u304c\u3001\u5148\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30d6\u30e9\u30a6\u30b6\u306e UI \u3092\u64cd\u4f5c\u3057\u3066\u5168\u753b\u9762\u8868\u793a\u3092\u7d42\u4e86\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u306e\u3067\u3001\u30d5\u30e9\u30b0\u306e\u72b6\u614b\u304c\u5b9f\u969b\u306e\u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u3068\u30ba\u30ec\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-comcent-blog-headline01 modHeadline\">\u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u306b\u5fdc\u3058\u3066 CSS \u3092\u5206\u5c90\u3055\u305b\u308b<\/h4>\n\n\n\n<p>\u5168\u753b\u9762\u8868\u793a\u306e\u72b6\u614b\u306b\u5fdc\u3058\u3066 CSS \u3092\u5206\u5c90\u3055\u305b\u308b\u305f\u3081\u306b\u306f\u3001<code>:fullscreen<\/code>\u64ec\u4f3c\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted modBlobCode\"><img loading=\"lazy\"><code>html:fullscreen {\n  background-color: black;\n}\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8a18\u306eCSS\u306fhtml\u8981\u7d20\u304c\u5168\u753b\u9762\u8868\u793a\u306e\u5bfe\u8c61\u3068\u306a\u3063\u3066\u3044\u308b\u3068\u304d\u306b\u80cc\u666f\u8272\u3092\u9ed2\u306b\u3059\u308bCSS\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u901a\u5e38\u8868\u793a\u306e\u5834\u5408\u306f\u4e0a\u8a18\u306e CSS 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