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diff --git a/files/ja/web/api/bytelengthqueuingstrategy/bytelengthqueuingstrategy/index.html b/files/ja/web/api/bytelengthqueuingstrategy/bytelengthqueuingstrategy/index.html
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+---
+title: ByteLengthQueuingStrategy.ByteLengthQueuingStrategy()
+slug: Web/API/ByteLengthQueuingStrategy/ByteLengthQueuingStrategy
+tags:
+  - API
+  - ByteLengthQueuingStrategy
+  - Constructor
+  - Experimental
+  - Reference
+  - Streams
+translation_of: Web/API/ByteLengthQueuingStrategy/ByteLengthQueuingStrategy
+---
+<div>{{draft}}{{SeeCompatTable}}{{APIRef("Streams")}}</div>
+
+<p class="summary"><span class="seoSummary"><strong><code>ByteLengthQueuingStrategy()</code></strong> コンストラクターは、<code>ByteLengthQueuingStrategy</code> オブジェクトのインスタンスを作成して返します。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">var <em>byteLengthQueuingStrategy</em> = new ByteLengthQueuingStrategy({<em>highWaterMark</em>});</pre>
+
+<h3 id="Parameters" name="Parameters">パラメーター</h3>
+
+<dl>
+ <dt>{highWaterMark}</dt>
+ <dd><code>highWaterMark</code> プロパティを含むオブジェクト。 これは、バックプレッシャーが適用される前に内部キューに含めることができるチャンクの総数を定義する負でない整数です。</dd>
+</dl>
+
+<h3 id="Return_value" name="Return_value">戻り値</h3>
+
+<p>{{domxref("ByteLengthQueuingStrategy")}} オブジェクトのインスタンス。</p>
+
+<h3 id="Exceptions" name="Exceptions">例外</h3>
+
+<p>なし。</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<pre class="brush: js line-numbers  language-js"><code class="language-js"><span class="keyword token">const</span> queuingStrategy <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">ByteLengthQueuingStrategy</span><span class="punctuation token">(</span><span class="punctuation token">{</span> highWaterMark<span class="punctuation token">:</span> <span class="number token">1</span> <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+<span class="keyword token">const</span> readableStream <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">ReadableStream</span><span class="punctuation token">(</span><span class="punctuation token">{</span>
+  <span class="function token">start</span><span class="punctuation token">(</span>controller<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span><span class="punctuation token">,</span>
+  <span class="function token">pull</span><span class="punctuation token">(</span>controller<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span><span class="punctuation token">,</span>
+  <span class="function token">cancel</span><span class="punctuation token">(</span>err<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="string token">"stream error:"</span><span class="punctuation token">,</span> err<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="punctuation token">}</span>
+<span class="punctuation token">}</span><span class="punctuation token">,</span> queuingStrategy<span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+<span class="keyword token">var</span> size <span class="operator token">=</span> queuingStrategy<span class="punctuation token">.</span><span class="function token">size</span><span class="punctuation token">(</span>chunk<span class="punctuation token">)</span></code>;</pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">状態</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("Streams","#blqs-constructor","ByteLengthQueuingStrategy()")}}</td>
+   <td>{{Spec2('Streams')}}</td>
+   <td>初期定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("api.ByteLengthQueuingStrategy.ByteLengthQueuingStrategy")}}</p>
diff --git a/files/ja/web/api/bytelengthqueuingstrategy/index.html b/files/ja/web/api/bytelengthqueuingstrategy/index.html
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index 0000000000..317571bb8b
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@@ -0,0 +1,76 @@
+---
+title: ByteLengthQueuingStrategy
+slug: Web/API/ByteLengthQueuingStrategy
+tags:
+  - API
+  - ByteLengthQueuingStrategy
+  - Experimental
+  - Interface
+  - Reference
+  - Streams
+translation_of: Web/API/ByteLengthQueuingStrategy
+---
+<p>{{SeeCompatTable}}{{APIRef("Streams")}}</p>
+
+<p><span class="seoSummary"><a href="/ja/docs/Web/API/Streams_API">Streams API</a> の <strong><code>ByteLengthQueuingStrategy</code></strong> インターフェイスは、ストリームを構築するときに使用できる組み込みのバイト長キューイング戦略を提供します。</span></p>
+
+<h2 id="Constructor" name="Constructor">コンストラクター</h2>
+
+<dl>
+ <dt>{{domxref("ByteLengthQueuingStrategy.ByteLengthQueuingStrategy", "ByteLengthQueuingStrategy()")}}</dt>
+ <dd>新しい <code>ByteLengthQueuingStrategy</code> オブジェクトのインスタンスを作成します。</dd>
+</dl>
+
+<h2 id="Properties" name="Properties">プロパティ</h2>
+
+<p>なし。</p>
+
+<h2 id="Methods" name="Methods">メソッド</h2>
+
+<dl>
+ <dt>{{domxref("ByteLengthQueuingStrategy.size()")}}</dt>
+ <dd>所与のチャンクの <code>byteLength</code> プロパティを返します。</dd>
+</dl>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<pre class="brush: js line-numbers  language-js"><code class="language-js"><span class="keyword token">const</span> queueingStrategy <span class="operator token">=</span> <span class="keyword token">new</span> ByteLength<span class="class-name token">QueuingStrategy</span><span class="punctuation token">(</span><span class="punctuation token">{</span> highWaterMark<span class="punctuation token">:</span> <span class="number token">1</span> <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+<span class="keyword token">const</span> readableStream <span class="operator token">=</span> <span class="keyword token">new</span> Readable<span class="class-name token">Stream</span><span class="punctuation token">(</span><span class="punctuation token">{</span>
+  <span class="function token">start</span><span class="punctuation token">(</span>controller<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span><span class="punctuation token">,</span>
+  pull<span class="punctuation token">(controller</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span><span class="punctuation token">,</span>
+  <span class="function token">cancel</span><span class="punctuation token">(</span>err<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="string token">"stream error:"</span><span class="punctuation token">,</span> err<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="punctuation token">}</span>
+<span class="punctuation token">}</span><span class="punctuation token">,</span> queueingStrategy<span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+<span class="keyword token">var</span> size <span class="operator token">=</span> queueingStrategy<span class="punctuation token">.</span><span class="function token">size</span><span class="punctuation token">(</span><span class="punctuation token">chunk)</span></code>;</pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">状態</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Streams','#blqs-class','ByteLengthQueuingStrategy')}}</td>
+   <td>{{Spec2('Streams')}}</td>
+   <td>初期定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_Compatibility" name="Browser_Compatibility">ブラウザーの互換性</h2>
+
+<div>
+
+
+<p>{{Compat("api.ByteLengthQueuingStrategy")}}</p>
+</div>
diff --git a/files/ja/web/api/bytelengthqueuingstrategy/size/index.html b/files/ja/web/api/bytelengthqueuingstrategy/size/index.html
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--- /dev/null
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@@ -0,0 +1,72 @@
+---
+title: ByteLengthQueuingStrategy.size()
+slug: Web/API/ByteLengthQueuingStrategy/size
+tags:
+  - API
+  - ByteLengthQueuingStrategy
+  - Experimental
+  - Method
+  - Reference
+  - Streams
+  - size
+translation_of: Web/API/ByteLengthQueuingStrategy/size
+---
+<div>{{draft}}{{SeeCompatTable}}{{APIRef("Streams")}}</div>
+
+<p class="summary"><span class="seoSummary">{{domxref("ByteLengthQueuingStrategy")}} インターフェイスの <strong><code>size()</code></strong> メソッドは、所与のチャンクの <code>byteLength</code> プロパティを返します。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox"><var><code>var <em>size</em> = </code>byteLengthQueuingStrategy</var>.size(<em>chunk</em>);</pre>
+
+<h3 id="Parameters" name="Parameters">パラメーター</h3>
+
+<dl>
+ <dt>chunk</dt>
+ <dd>ストリームを通過するデータのチャンク。</dd>
+</dl>
+
+<h3 id="Return_value" name="Return_value">戻り値</h3>
+
+<p>所与のチャンクのバイト長を表す整数。</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<pre class="brush: js line-numbers  language-js"><code class="language-js"><span class="keyword token">const</span> queuingStrategy <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">ByteLengthQueuingStrategy</span><span class="punctuation token">(</span><span class="punctuation token">{</span> highWaterMark<span class="punctuation token">:</span> <span class="number token">1</span> <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+<span class="keyword token">const</span> readableStream <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">ReadableStream</span><span class="punctuation token">(</span><span class="punctuation token">{</span>
+  <span class="function token">start</span><span class="punctuation token">(</span>controller<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span><span class="punctuation token">,</span>
+  <span class="function token">pull</span><span class="punctuation token">(</span>controller<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span><span class="punctuation token">,</span>
+  <span class="function token">cancel</span><span class="punctuation token">(</span>err<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="string token">"stream error:"</span><span class="punctuation token">,</span> err<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="punctuation token">}</span>
+<span class="punctuation token">}</span><span class="punctuation token">,</span> queuingStrategy<span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+<span class="keyword token">var</span> size <span class="operator token">=</span> queueingStrategy<span class="punctuation token">.</span><span class="function token">size</span><span class="punctuation token">(</span>chunk<span class="punctuation token">)</span></code>;</pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">状態</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("Streams","#blqs-size","size")}}</td>
+   <td>{{Spec2('Streams')}}</td>
+   <td>初期定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("api.ByteLengthQueuingStrategy.size")}}</p>