JavaScript の算術演算子の文書を更新

- 2021/09/10 時点の英語版に同期

1 files changed, 38 insertions, 48 deletions

diff --git a/files/ja/web/javascript/reference/operators/multiplication/index.md b/files/ja/web/javascript/reference/operators/multiplication/index.md
index 4aed5ac7f6..2dd23d0093 100644
--- a/files/ja/web/javascript/reference/operators/multiplication/index.md
+++ b/files/ja/web/javascript/reference/operators/multiplication/index.md
@@ -3,72 +3,62 @@ title: 乗算 (*)
 slug: Web/JavaScript/Reference/Operators/Multiplication
 tags:
   - JavaScript
-  - Language feature
-  - Operator
+  - 言語機能
+  - 演算子
   - Reference
+browser-compat: javascript.operators.multiplication
 translation_of: Web/JavaScript/Reference/Operators/Multiplication
 ---
-<div>{{jsSidebar("Operators")}}</div>
+{{jsSidebar("Operators")}}
 
-<p>乗算演算子 (<code>*</code>) はオペランドの積を生成します。</p>
+乗算演算子 (`*`) はオペランドの積を生成します。
 
-<div>{{EmbedInteractiveExample("pages/js/expressions-multiplication.html")}}</div>
+{{EmbedInteractiveExample("pages/js/expressions-multiplication.html")}}
 
-<div></div>
+## 構文
 
+```js
+x * y
+```
 
+## 例
 
-<h2 id="構文">構文</h2>
+### 数値を用いた乗算
 
-<pre class="syntaxbox notranslate"><strong>Operator:</strong> <var>x</var> * <var>y</var>
-</pre>
-
-<h2 id="例">例</h2>
-
-<h3 id="数値を使用した乗算">数値を使用した乗算</h3>
-
-<pre class="brush: js notranslate"> 2 * 2      // 4
+```js
+ 2 * 2      // 4
 -2 * 2     // -4
-</pre>
-
-<h3 id="無限大との乗算">無限大との乗算</h3>
-
-<pre class="brush: js notranslate">Infinity * 0         // NaN
-Infinity * Infinity  // Infinity</pre>
+```
 
-<h3 id="非数との乗算">非数との乗算</h3>
+### 無限大との乗算
 
-<pre class="brush: js notranslate">'foo' * 2 // NaN</pre>
+```js
+Infinity * 0         // NaN
+Infinity * Infinity  // Infinity
+```
 
-<h2 id="仕様">仕様</h2>
+### 非数との乗算
 
-<table class="standard-table">
- <tbody>
-  <tr>
-   <th scope="col">仕様</th>
-  </tr>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-multiplicative-operators', 'Multiplication operator')}}</td>
-  </tr>
- </tbody>
-</table>
+```js
+'foo' * 2 // NaN
+```
 
-<h2 id="ブラウザーの互換性">ブラウザーの互換性</h2>
+## 仕様書
 
+{{Specifications}}
 
+## ブラウザーの互換性
 
-<p>{{Compat("javascript.operators.multiplication")}}</p>
+{{Compat}}
 
-<h2 id="関連項目">関連項目</h2>
+## 関連情報
 
-<ul>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Addition">加算演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Subtraction">減算演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Division">除算演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Remainder">剰余演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Exponentiation">べき乗演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Increment">インクリメント演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Decrement">デクリメント演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Unary_negation">単項マイナス演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Unary_plus">単項プラス演算子</a></li>
-</ul>
+- [加算演算子](/ja/docs/Web/JavaScript/Reference/Operators/Addition)
+- [減算演算子](/ja/docs/Web/JavaScript/Reference/Operators/Subtraction)
+- [除算演算子](/ja/docs/Web/JavaScript/Reference/Operators/Division)
+- [剰余演算子](/ja/docs/Web/JavaScript/Reference/Operators/Remainder)
+- [べき乗演算子](/ja/docs/Web/JavaScript/Reference/Operators/Exponentiation)
+- [インクリメント演算子](/ja/docs/Web/JavaScript/Reference/Operators/Increment)
+- [デクリメント演算子](/ja/docs/Web/JavaScript/Reference/Operators/Decrement)
+- [単項マイナス演算子](/ja/docs/Web/JavaScript/Reference/Operators/Unary_negation)
+- [単項プラス演算子](/ja/docs/Web/JavaScript/Reference/Operators/Unary_plus)