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.
• NEW: In beta 5, accessing sites that use client side SSL certificates does not work and may cause the application to crash.
• 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 input 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.
  • NEW: 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.
• In some cases, your device may fail to sync contacts, calendars and account settings, or back up to iTunes. If this happens, reboot your device and re-sync.
• FIXED: In some cases, syncing photos may result in only thumbnails on your device. If this happens, unsync Photos then re-sync again.

Xcode

• FIXED: In beta 4, device restores using Xcode were disabled. This has been fixed. Device restores are now enabled and work in Xcode.
• 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.
• NEW: Xcode fails to build a Page-based template. You can work around this issue by adding the Core Graphics framework to your project.