Version 2.43.1
- Fix: #259 - Test fonts should now work with --enable-installed-tests
- Fix: #277 - Don't panic when trying to filter an empty group
  (Ivan Molodetskikh).
- Fix: #292 - Don't panic if we try to clip an empty group.
- Fix the feOffset filter's coordinate parsing.  (Ivan Molodetskikh).
- Fix linearization of SRGB data in the feComposite filter (Ivan
  Molodetskikh).
- Fix CSS cascading in filters (Ivan Molodetskikh).
- Fix, don't render filters if they are in error (Ivan Molodetskikh).
- Fixed a couple of memory leaks in the test suite.
- Filters now support FillPaint and StrokePaint for input (Ivan Molodetskikh).
- Filters now support the color-interpolation-filters property
  (Ivan Molodetskikh).
- The feImage, feBlend, feComponentTransfer filters are now in Rust
  (Ivan Molodetskikh).
- The feOffset filter now supports fractional offsets (Ivan Molodetskikh).
- The drawing context code is now in Rust.  This is a tremendous
  amount of work! (Paolo Borelli)
- All the style property parsers have been moved to rust-cssparser.