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# iOS & iPadOS 13.3 Release Notes

Update your apps to use new features, and test your apps against API changes.

## Discussion

The iOS & iPadOS 13.3 SDK provides support for developing apps for iPhone, iPad, and iPod touch devices running iOS & iPadOS 13.3. The SDK comes bundled with Xcode 11.3 available from the Mac App Store. For information on the compatibility requirements for Xcode 11.3, see <doc://com.apple.documentation/documentation/Xcode-Release-Notes/xcode-11_3-release-notes>.

### Networking

#### New Features

- Certain top-level domains (TLDs) such as `.dev` and `.app` are now in the Foundation <doc://com.apple.documentation/documentation/Foundation/URLSession> and <doc://com.apple.documentation/documentation/Foundation/NSURLConnection> HTTP Strict Transport Security (HSTS) preload list. An app which uses <doc://com.apple.documentation/documentation/Foundation/URLSession> to visit a matching URL will always navigate to the URL as `https://`, and never as cleartext `http://`. See the [HTTP Strict Transport Security (HSTS) Specification](https://tools.ietf.org/html/rfc6797) for more information about HSTS. (56247242)

### Safari

#### New Features

- Now supports NFC, USB, and Lightning FIDO2-compliant security keys in Safari, <doc://com.apple.documentation/documentation/SafariServices/SFSafariViewController>, and <doc://com.apple.documentation/documentation/AuthenticationServices/ASWebAuthenticationSession> using the WebAuthn standard, on devices with the necessary hardware capabilities.

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