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node_modules/feature-policy/README.md

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+Feature Policy
+==============
+[![Build Status](https://travis-ci.org/helmetjs/feature-policy.svg?branch=master)](https://travis-ci.org/helmetjs/feature-policy)
+
+This is Express middleware to set the `Feature-Policy` header. You can read more about it [here](https://scotthelme.co.uk/a-new-security-header-feature-policy/) and [here](https://developers.google.com/web/updates/2018/06/feature-policy).
+
+To use:
+
+```javascript
+const featurePolicy = require('feature-policy')
+
+// ...
+
+app.use(featurePolicy({
+  features: {
+    fullscreen: ["'self'"],
+    vibrate: ["'none'"],
+    payment: ['example.com'],
+    syncXhr: ["'none'"]
+  }
+}))
+```
+
+The following features are currently supported:
+
+* `accelerometer`
+* `ambientLightSensor`
+* `autoplay`
+* `camera`
+* `documentDomain`
+* `documentWrite`
+* `encryptedMedia`
+* `fontDisplayLateSwap`
+* `fullscreen`
+* `geolocation`
+* `gyroscope`
+* `layoutAnimations`
+* `legacyImageFormats`
+* `loadingFrameDefaultEager`
+* `magnetometer`
+* `microphone`
+* `midi`
+* `oversizedImages`
+* `payment`
+* `pictureInPicture`
+* `serial`
+* `speaker`
+* `syncScript`
+* `syncXhr`
+* `unoptimizedImages`
+* `unoptimizedLosslessImages`
+* `unoptimizedLossyImages`
+* `unsizedMedia`
+* `usb`
+* `verticalScroll`
+* `vibrate`
+* `vr`
+* `wakeLock`
+* `xr`