From febc362abf2ea4dc4bd87ca2a52b09d23236ab83 Mon Sep 17 00:00:00 2001
From: Masahiro FUJIMOTO <mfujimot@gmail.com>
Date: Thu, 3 Feb 2022 09:51:47 +0900
Subject: GeolocationCoordinates 以下を移行
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+---
+title: GeolocationCoordinates.altitudeAccuracy
+slug: Web/API/GeolocationCoordinates/altitudeAccuracy
+tags:
+  - API
+  - Geolocation API
+  - GeolocationCoordinates
+  - Property
+  - Secure context
+  - altitudeAccuracy
+browser-compat: api.GeolocationCoordinates.altitudeAccuracy
+---
+{{securecontext_header}}{{APIRef("Geolocation API")}}
+
+The **`GeolocationCoordinates.altitudeAccuracy`** read-only
+property is a strictly positive `double` representing the accuracy, with a
+95% confidence level, of the `altitude` expressed in meters. This value is
+`null` if the implementation doesn't support measuring altitude.
+
+## Syntax
+
+```js
+let altAcc = geolocationCoordinatesInstance.altitudeAccuracy
+```
+
+### Value
+
+A positive `double` representing the accuracy, with a 95% confidence level,
+of the `altitude` expressed in meters.
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- [Using the Geolocation API](/en-US/docs/Web/API/Geolocation_API/Using_the_Geolocation_API)
+- {{domxref("GeolocationCoordinates")}}
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