HTML（HyperText Markup Language）は、ウェブページの構造を作成するための標準的なマークアップ言語です。ウェブサイトやウェブアプリケーションを作成する際、HTMLはコンテンツを構造化し、視覚的な要素やリンク、メディアなどを表示するために使用されます。HTMLはウェブの基盤となる技術の一つであり、他の言語と組み合わせて動的でインタラクティブなウェブページを作成するために用いられます。
HTMLの基本的な構成要素
HTML文書は、いくつかの基本的な要素から成り立っています。最も重要な要素は「タグ」と呼ばれ、これによりウェブページのコンテンツや構造が定義されます。タグは通常、角括弧（< >）で囲まれており、開始タグと終了タグのペアとして使われます。例えば、段落を定義するためには
タグを使用します。
1. ドキュメントタイプ宣言（DOCTYPE宣言）
HTML文書の最初に記載されるのがDOCTYPE宣言です。これは、文書がどのHTMLのバージョンで書かれているかをブラウザに示すもので、HTML5の場合は以下のように記載します：
2.
HTML文書全体を囲む最も基本的なタグがタグです。このタグ内には、ページ全体のコンテンツが配置されます。タグは開始タグと終了タグを持ち、文書全体を示します。
3.
タグは、HTML文書のメタ情報やリンク、スタイルシート、スクリプトなどを定義するための部分です。この部分はブラウザに直接表示されることはなく、ウェブページの構造や動作に影響を与えます。タグ内には、以下のような要素が含まれることがあります。
タグ（文書の文字エンコーディングや言語を指定）</code>タグ（ページのタイトルを設定）</li> <li data-start="903" data-end="930"><code data-start="905" data-end="913"><link></code>タグ（外部スタイルシートをリンク）</li> <li data-start="931" data-end="958"><code data-start="933" data-end="942"><br /> <style></code>タグ（内部スタイルシートを定義）</li> <li data-start="959" data-end="991"><code data-start="961" data-end="971"><script></code>タグ（JavaScriptコードを挿入）</li> </ul> <pre class="!overflow-visible" data-start="993" data-end="1116"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">head</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">meta</span></span></span><span> </span><span><span class="hljs-attr">charset</span></span><span>=</span><span><span class="hljs-string">"UTF-8"</span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">title</span></span></span><span>>ウェブページのタイトル</span><span><span class="hljs-tag"></<span class="hljs-name">title</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">link</span></span></span><span> </span><span><span class="hljs-attr">rel</span></span><span>=</span><span><span class="hljs-string">"stylesheet"</span></span><span> </span><span><span class="hljs-attr">href</span></span><span>=</span><span><span class="hljs-string">"style.css"</span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">head</span></span></span><span>> </span></span></code></div></div></pre> <h4 data-start="1118" data-end="1136">4. <code data-start="1126" data-end="1134"><body></code>タグ</h4> <p data-start="1137" data-end="1259"><code data-start="1137" data-end="1145"><body></code>タグは、実際にブラウザに表示されるコンテンツが含まれる部分です。テキスト、画像、リンク、ボタンなど、ユーザーがインタラクトするすべての要素はこの部分に配置されます。例えば、段落やリスト、画像などを表示するためのタグが含まれます。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <pre class="!overflow-visible" data-start="1261" data-end="1329"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">body</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">h1</span></span></span><span>>ウェルカムページ</span><span><span class="hljs-tag"></<span class="hljs-name">h1</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">p</span></span></span><span>>これはHTMLの例です。</span><span><span class="hljs-tag"></<span class="hljs-name">p</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">body</span></span></span><span>> </span></span></code></div></div></pre> <h3 data-start="1331" data-end="1352">HTMLの基本的なタグとその使用例</h3> <p data-start="1354" data-end="1395">HTMLにはさまざまなタグがありますが、以下は最もよく使用される基本的なタグです。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <h4 data-start="1397" data-end="1410">1. 見出しタグ</h4> <p data-start="1411" data-end="1521">HTMLには6種類の見出しタグ（<code data-start="1427" data-end="1433"></p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <h2></code>～<code data-start="1434" data-end="1440"></p> <h6></code>）があります。これらは、ウェブページの重要な見出しを定義するために使用されます。<code data-start="1480" data-end="1486"></p> <h2></code>は最も重要な見出し、<code data-start="1496" data-end="1502"></p> <h6></code>は最も低い重要度の見出しを意味します。</p> <pre class="!overflow-visible" data-start="1523" data-end="1570"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">h1</span></span></span><span>>最も重要な見出し</span><span><span class="hljs-tag"></<span class="hljs-name">h1</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">h2</span></span></span><span>>次に重要な見出し</span><span><span class="hljs-tag"></<span class="hljs-name">h2</span></span></span><span>> </span></span></code></div></div></pre> <h4 data-start="1572" data-end="1584">2. 段落タグ</h4> <p data-start="1585" data-end="1639">段落を作成するためには<code data-start="1596" data-end="1601"></p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <p></code>タグを使用します。テキストが段落として表示され、文書内で内容が区切られます。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <pre class="!overflow-visible" data-start="1641" data-end="1668"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">p</span></span></span><span>>これは段落です。</span><span><span class="hljs-tag"></<span class="hljs-name">p</span></span></span><span>> </span></span></code></div></div></pre> <h4 data-start="1670" data-end="1683">3. リストタグ</h4> <p data-start="1684" data-end="1755">HTMLでは順序付きリスト（<code data-start="1698" data-end="1704"></p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <ol></code>）や順不同リスト（<code data-start="1713" data-end="1719"></p> <ul></code>）を作成することができます。リストの項目は<code data-start="1740" data-end="1746"></p> <li></code>タグで定義します。</p> <ul data-start="1757" data-end="1767"> <li data-start="1757" data-end="1767">順序付きリスト：</li> </ul> <pre class="!overflow-visible" data-start="1768" data-end="1823"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">ol</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">li</span></span></span><span>>最初の項目</span><span><span class="hljs-tag"></<span class="hljs-name">li</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">li</span></span></span><span>>次の項目</span><span><span class="hljs-tag"></<span class="hljs-name">li</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">ol</span></span></span><span>> </span></span></code></div></div></pre> <ul data-start="1825" data-end="1834"> <li data-start="1825" data-end="1834">順不同リスト：</li> </ul> <pre class="!overflow-visible" data-start="1835" data-end="1891"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">ul</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">li</span></span></span><span>>アイテム1</span><span><span class="hljs-tag"></<span class="hljs-name">li</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">li</span></span></span><span>>アイテム2</span><span><span class="hljs-tag"></<span class="hljs-name">li</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">ul</span></span></span><span>> </span></span></code></div></div></pre> <h4 data-start="1893" data-end="1906">4. リンクタグ</h4> <p data-start="1907" data-end="1957">リンクを作成するためには<code data-start="1919" data-end="1924"><a></code>タグを使用します。<code data-start="1933" data-end="1939">href</code>属性にリンク先のURLを指定します。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <pre class="!overflow-visible" data-start="1959" data-end="2019"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">a</span></span></span><span> </span><span><span class="hljs-attr">href</span></span><span>=</span><span><span class="hljs-string">"https://www.example.com"</span></span><span>>Exampleサイト</span><span><span class="hljs-tag"></<span class="hljs-name">a</span></span></span><span>> </span></span></code></div></div></pre> <h4 data-start="2021" data-end="2033">5. 画像タグ</h4> <p data-start="2034" data-end="2121">画像をウェブページに表示するためには<code data-start="2052" data-end="2059"><img></code>タグを使用します。<code data-start="2068" data-end="2073">src</code>属性に画像のURLを指定し、<code data-start="2087" data-end="2092">alt</code>属性には画像が表示されない場合の代替テキストを記述します。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <pre class="!overflow-visible" data-start="2123" data-end="2168"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">img</span></span></span><span> </span><span><span class="hljs-attr">src</span></span><span>=</span><span><span class="hljs-string">"image.jpg"</span></span><span> </span><span><span class="hljs-attr">alt</span></span><span>=</span><span><span class="hljs-string">"画像の説明"</span></span><span>> </span></span></code></div></div></pre> <h3 data-start="2170" data-end="2185">HTML5の新しい要素</h3> <p data-start="2187" data-end="2299">HTML5では、従来のタグに加えて新しいセマンティック要素が追加され、文書の意味構造をより明確にしました。これにより、検索エンジンやユーザーエージェント（ブラウザ）がコンテンツをより理解しやすくなります。以下はその一部です。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <ul data-start="2301" data-end="2467"> <li data-start="2301" data-end="2336"><code data-start="2303" data-end="2313"><br /> <header></code>: ページやセクションのヘッダーを定義します。</li> <li data-start="2337" data-end="2372"><code data-start="2339" data-end="2349"><br /> <footer></code>: ページやセクションのフッターを定義します。</li> <li data-start="2373" data-end="2404"><code data-start="2375" data-end="2386"><br /> <article></code>: 独立したコンテンツを定義します。</li> <li data-start="2405" data-end="2438"><code data-start="2407" data-end="2418"><br /> <section></code>: 複数のコンテンツをグループ化します。</li> <li data-start="2439" data-end="2467"><code data-start="2441" data-end="2448"><br /> <nav></code>: ナビゲーションリンクを定義します。</li> </ul> <pre class="!overflow-visible" data-start="2469" data-end="2623"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">header</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">h1</span></span></span><span>>ウェブサイトのタイトル</span><span><span class="hljs-tag"></<span class="hljs-name">h1</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">header</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">article</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">h2</span></span></span><span>>記事のタイトル</span><span><span class="hljs-tag"></<span class="hljs-name">h2</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">p</span></span></span><span>>記事の内容...</span><span><span class="hljs-tag"></<span class="hljs-name">p</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">article</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">footer</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">p</span></span></span><span>>© 2025 ウェブサイト名</span><span><span class="hljs-tag"></<span class="hljs-name">p</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">footer</span></span></span><span>> </span></span></code></div></div></pre> <h3 data-start="2625" data-end="2636">HTMLの属性</h3> <p data-start="2638" data-end="2769">HTMLのタグには、タグの動作や外観を変更するための属性を設定することができます。属性は、タグの開始タグ内に記述され、<code data-start="2697" data-end="2711">name="value"</code>の形式で指定されます。例えば、<code data-start="2726" data-end="2731"><a></code>タグの<code data-start="2734" data-end="2740">href</code>属性や、<code data-start="2744" data-end="2751"><img></code>タグの<code data-start="2754" data-end="2759">src</code>属性などがあります。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <h4 data-start="2771" data-end="2788">1. <code data-start="2779" data-end="2786">class</code>属性</h4> <p data-start="2789" data-end="2825"><code data-start="2789" data-end="2796">class</code>属性は、CSSで特定のスタイルを適用するために使用します。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <pre class="!overflow-visible" data-start="2827" data-end="2881"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">p</span></span></span><span> </span><span><span class="hljs-attr">class</span></span><span>=</span><span><span class="hljs-string">"intro"</span></span><span>>この段落には特定のスタイルが適用されます。</span><span><span class="hljs-tag"></<span class="hljs-name">p</span></span></span><span>> </span></span></code></div></div></pre> <h4 data-start="2883" data-end="2897">2. <code data-start="2891" data-end="2895">id</code>属性</h4> <p data-start="2898" data-end="2983"><code data-start="2898" data-end="2902">id</code>属性は、HTML要素に一意の識別子を付けるために使用します。JavaScriptやCSSでこの<code data-start="2949" data-end="2953">id</code>を利用して、要素にアクセスしたりスタイルを変更したりします。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <pre class="!overflow-visible" data-start="2985" data-end="3026"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-tag"><<span class="hljs-name">div</span></span></span><span> </span><span><span class="hljs-attr">id</span></span><span>=</span><span><span class="hljs-string">"header"</span></span><span>>ヘッダー内容</span><span><span class="hljs-tag"></<span class="hljs-name">div</span></span></span><span>> </span></span></code></div></div></pre> <h3 data-start="3028" data-end="3043">HTMLの重要性と役割</h3> <p data-start="3045" data-end="3203">HTMLはウェブ開発の基盤となる技術であり、ウェブページの内容と構造を定義します。ウェブページのデザインや動的な機能を作成するためには、HTMLだけでなく、CSS（Cascading Style Sheets）やJavaScriptといった他の技術も必要ですが、HTMLは全てのウェブページの土台として欠かせません。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <p data-start="3205" data-end="3341">ウェブ開発において、HTMLは検索エンジン最適化（SEO）やアクセシビリティ（A11Y）の観点からも重要です。意味のあるHTMLタグを正しく使用することで、検索エンジンにおけるランキングを向上させることができ、視覚障害を持つユーザーにも適切な情報を提供することができます。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> <p data-start="3343" data-end="3413" data-is-last-node="" data-is-only-node="">HTMLの進化により、より豊かなウェブ体験が可能になり、ウェブ開発者はその知識を活用してインタラクティブで魅力的なサイトを作り上げています。</p><div class="bunkao-paragraph-ad" data-bunkao-ad><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-3293364314201893" data-ad-slot="2303082872" data-ad-format="auto" data-full-width-responsive="true"></ins></div> </div> </div> </div> </div><div class="article-tags"><a href="https://bunkao.com/category/%e3%82%b3%e3%83%b3%e3%83%94%e3%83%a5%e3%83%bc%e3%82%bf/">コンピュータ</a></div><div class="article-tools"><p>この読みものをシェア</p><div><button 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class="article-sidebar-disclosure" open><summary>テーマと、今日の日本 <svg aria-hidden="true" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M4 12h15m-6-6 6 6-6 6"/></svg></summary><div class="article-sidebar-stack" style="--topic-accent:#405c83;--topic-tint:#e6ebf3;"><section class="aside-note"><span class="topic-kanji" aria-hidden="true">知</span><h2>次の好奇心へ。</h2><p>テーマから、新しい読みものを見つけませんか。</p><a class="text-link" href="https://bunkao.com/categories/">カテゴリーを見る <svg aria-hidden="true" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M4 12h15m-6-6 6 6-6 6"/></svg></a></section><section class="sidebar-card sidebar-topics"><p class="eyebrow">テーマをひらく</p><h2>おすすめのカテゴリー</h2><nav aria-label="おすすめのカテゴリー"><a 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class="eyebrow">今日の日本</p><h2>暦のひとこと</h2><time class="sidebar-day-date" data-side-date datetime="2026-10-27">2026年10月27日（火）</time><div class="sidebar-day-event"><span data-side-day-kind>今日の暦</span><strong data-side-day-event>今日は国民の祝日ではありません。</strong></div><p class="sidebar-next-day" data-side-next-day>次の祝日：11-03 文化の日</p><a class="text-link" href="https://bunkao.com/japan-calendar/">日本の暦を見る <svg aria-hidden="true" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M4 12h15m-6-6 6 6-6 6"/></svg></a></section><script type="application/json" 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class="sidebar-card regional-weather" data-regional-weather><p class="eyebrow">日本の各地</p><h2>全国の天気便り</h2><p class="sidebar-widget-caption">主要10都市の予報</p><div class="regional-weather-list"><a class="regional-weather-row" data-weather-region="sapporo" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=016000" target="_blank" rel="noopener noreferrer"><span class="weather-place">北海道<small>札幌</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="sendai" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=040000" target="_blank" rel="noopener noreferrer"><span class="weather-place">東北<small>仙台</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="tokyo" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=130000" target="_blank" rel="noopener noreferrer"><span class="weather-place">関東<small>東京</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="niigata" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=150000" target="_blank" rel="noopener noreferrer"><span class="weather-place">北陸<small>新潟</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="nagoya" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=230000" target="_blank" rel="noopener noreferrer"><span class="weather-place">東海<small>名古屋</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="osaka" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=270000" target="_blank" rel="noopener noreferrer"><span class="weather-place">近畿<small>大阪</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="hiroshima" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=340000" target="_blank" rel="noopener noreferrer"><span class="weather-place">中国<small>広島</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="takamatsu" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=370000" target="_blank" rel="noopener noreferrer"><span class="weather-place">四国<small>高松</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="fukuoka" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=400000" target="_blank" rel="noopener noreferrer"><span class="weather-place">九州<small>福岡</small></span><span class="regional-weather-result" data-region-result>—</span></a><a class="regional-weather-row" data-weather-region="naha" href="https://www.jma.go.jp/bosai/forecast/#area_type=offices&area_code=471000" target="_blank" rel="noopener noreferrer"><span class="weather-place">沖縄<small>那覇</small></span><span class="regional-weather-result" data-region-result>—</span></a></div><p class="regional-weather-status" data-regional-weather-status role="status">都市名から、気象庁の詳しい予報へ。</p><a class="sidebar-source" href="https://www.jma.go.jp/bosai/forecast/" target="_blank" rel="noopener noreferrer">出典：気象庁（表示を編集） ↗</a><noscript><p class="sidebar-widget-caption">各都市を選ぶと気象庁の詳しい予報を確認できます。</p></noscript></section></div></details></aside></div><section class="section related-section"><div class="section-title"><div><p class="eyebrow">あわせて読みたい</p><h2>同じテーマの読みもの</h2></div></div><div class="story-grid"> <article class="story-card"> <a class="story-image" href="https://bunkao.com/harunobu-excel-machine-readability-guide/" tabindex="-1" aria-hidden="true"><img width="768" 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