From 6af2bcbf00561c619ff08feca36ac90e1dd4d991 Mon Sep 17 00:00:00 2001
From: Masahiro FUJIMOTO <mfujimot@gmail.com>
Date: Thu, 3 Feb 2022 09:59:33 +0900
Subject: 2021/09/15 時点の英語版に同期
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---
 .../web/api/geolocationcoordinates/speed/index.md  | 25 +++++++++++-----------
 1 file changed, 12 insertions(+), 13 deletions(-)

(limited to 'files')

diff --git a/files/ja/web/api/geolocationcoordinates/speed/index.md b/files/ja/web/api/geolocationcoordinates/speed/index.md
index 649ca264f1..f7c26bd75a 100644
--- a/files/ja/web/api/geolocationcoordinates/speed/index.md
+++ b/files/ja/web/api/geolocationcoordinates/speed/index.md
@@ -3,38 +3,37 @@ title: GeolocationCoordinates.speed
 slug: Web/API/GeolocationCoordinates/speed
 tags:
   - API
-  - Geolocation API
+  - 位置情報 API
   - GeolocationCoordinates
-  - Property
-  - Secure context
+  - プロパティ
+  - 安全なコンテキスト
   - speed
 browser-compat: api.GeolocationCoordinates.speed
+translation_of: Web/API/GeolocationCoordinates/speed
 ---
 {{securecontext_header}}{{APIRef("Geolocation API")}}
 
-The **`GeolocationCoordinates.speed`** read-only property is a
-`double` representing the velocity of the device in meters per second. This
-value is `null` if the implementation is not able to measure it.
+**`GeolocationCoordinates.speed`** は読み取り専用のプロパティであり、 `double` 型で端末の移動速度をメートル毎秒で表します。実装でこれを計測することができなければ、この値は `null` になります。
 
-## Syntax
+## 構文
 
 ```js
 let speed = geolocationCoordinatesInstance.speed
 ```
 
-### Value
+### 値
 
-A `double` representing the velocity of the device in meters per second.
+`double` 型で端末の移動速度をメートル毎秒で表します。
 
-## Specifications
+## 仕様書
 
 {{Specifications}}
 
-## Browser compatibility
+## ブラウザーの互換性
 
 {{Compat}}
 
-## See also
+## 関連情報
 
-- [Using the Geolocation API](/en-US/docs/Web/API/Geolocation_API/Using_the_Geolocation_API)
+- [位置情報 API の使用](/ja/docs/Web/API/Geolocation_API/Using_the_Geolocation_API)
 - {{domxref("GeolocationCoordinates")}}
-- 
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