What's new in the WebKitGTK 2.53.2 release?
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  - Only use DMA-BUF mapping for writing to the GPU atlas when possible.
  - Do not resolve '-apple-system' font to default system font.
  - Set real time limits when not using the portal.
  - Report support for supported non-AAC mp4a codecs.
  - Fix several crashes and rendering issues.