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.

New in Flow 6.3:
- Performance optimisations, most notably when matching CSS.
- Added structuredClone() and reportError().
- Improved stack traces when exceptions thrown.
- about:blank same-origin fixes.

New in Flow 6.2:
- Improvements to the JS API, beginning the update towards SVG 2 and making it easier to support shadow nodes
- Asynchronous scrolling bug fixes
- Work on CSS includes adding pseudo :where(), updating :not() to CSS4
- Reintroducing SVGMatrix for web compatibility