What's new in the WebKitGTK 2.47.1 release?
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  - Flatten layers to a plane when preseve-3d style is set.
  - Build GPU process by default, but keeping WebGL in the web process by default for now.
  - Use DMA-BUF buffers for WebGL when available.
  - Fix DuckDuckGo links by adding a user agent quirk.
  - Make GStreamer GL sink handle DMA-BUF memory to replace the DMA-BUF sink.
  - Fix several crashes and rendering issues.