New in Flow 6.6:
- File downloads, with a progress icon on GTK builds.
- FileReader API now supported allowing the upload of images into Google Docs.
- Improvements to media playback APIs.

New in Flow 6.5:
- Styling is performed in parallel. Elements are styled simultaneously using the available number cores.
- HTMLImageElement.decode() is now supported to improve sites with progressive display of images.
- Efficiency improvements for layout of empty blocks.

New in Flow 6.4:
- Secure contexts.
- New SVG APIs so JointJS can be used.
- Rewrite of all legacy bindings removing SVG 1.2T legacy pain (eg. diamond inheritance, SVGException...).
- line-height fixes to match other browsers.