Safari and WebKit

• In iOS 5, a new inherited CSS property, -webkit-overflow-scrolling, is available. The value touch allows the web developer to opt in to native-style scrolling in an overflow:scroll element. The default value for this property is auto, which allows single-finger scrolling without momentum.
• The WebKit framework has picked up a newer WebKit engine, which closely matches Safari 5.1. Some areas to be aware of with the new WebKit framework on iOS:
  • There is a new HTML5-compliant parser.
  • Text layout width may change slightly because word-rounding behavior now has floating-point-based precision.
  • There is improved validation of the form field, which includes removing leading zeros and number formatting.
  • Touch events are now supported on input fields.
  • window.onerror is now supported.
  • There is a new user agent that does not have locale information in the User Agent string.
  • URLs are now canonicalized by making the scheme all lowercase. If a fake URL is used to pass information from a UIWebView back to native code, make sure that the scheme is always lowercase, or that the native code compares the scheme in a case-insensitive manner.

Wi-Fi Syncing

• In iOS 5 beta 4 and later, wireless syncing is now available on Windows as well as the Mac. (This support requires OS X 10.6.8 or Lion.) You will see an option to enable wireless syncing when you connect your device to iTunes with the USB cable. It is recommended you perform your initial sync with a cable after restoring your device.
  • Wireless syncing is triggered automatically when the device is connected to power and on the same network as the paired computer. Or, you can manually trigger a sync from iTunes or from Settings > General > iTunes Sync (same network as paired computer required).
  • If you find issues with apps, media and/or photos synced to your device, you can reset then resync. From Settings > General > Reset, choose Erase all Content and Settings. Then reconnect to iTunes and sync again.

Xcode

• NEW: Starting with Xcode 4.2 in iOS 5.0 beta 7, support to run and debug applications in the iOS 4.3 Simulator and on devices with iOS versions older than 4.2 is made optional and installed on demand. This support is no longer shipped as part of the core tools packaging, and made available for download and installation through the “Downloads” pane of the Xcode Preferences panel. A valid iOS developer ADC account is required to obtain this content.To obtain the iOS 4.3 Simulator, select the “More Simulators…” item from the Run Destinations popup in the main toolbar. This will present the Downloads pane of the Preferences with UI to initiate the installation of the simulator.To obtain iOS device support for pre-iOS 4.2 devices, connect a device and activate it for development in the Organizer. Xcode will provide a prompt to initiate the download of the device support components.If the Xcode 4.2 in iOS 5.0 beta 7 is installed over a previous Xcode 4.2 beta or Xcode 4.1, the iOS 4.3 Simulator and device support from the previous install will already be present, and the additional components will display as “Installed” in the Downloads pane of the Xcode Preferences.The installation packages for the downloaded components will be stored in ~Library/Developer/Xcode. When a new version of Xcode (beta or GM) will be installed, subsequent requests to install these components will use the local packages without requiring a new download.
• In some cases, Xcode 4.2 Organizer does not display a device that is in restore mode. As a workaround you can use iTunes to restore.
• In iOS 5 beta 5, iOS Simulator is not compatible with previous releases of the iCloud Developer Seed for OS X. It is highly recommended that you update to the latest iCloud Developer Seed to ensure compatibility.
• iOS 5.0 SDK supports both iOS 4.3 and iOS 5.0 simulators