What's new in the WebKitGTK 2.30.3 release?
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  - Add new build option USE(64KB_PAGE_BLOCK).
  - Fix backdrop filters with rounded borders.
  - Fix scrolling iframes when async scrolling is enabled.
  - Allow applications to handle drag and drop on the web view again.
  - Update Outlook user agent quirk.
  - Fix the build with video support disabled.
  - Fix several crashes and rendering issues.