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nothing, it's their loss. But seeing how you can get JS support "for free", then there's no reason not to have both available.

• pcwalton 13y ago
  It's also possible to add other vendor prefixes "for free", but that didn't stop WebKit-only prefixes from appearing all over the mobile Web. Developers do what is easiest.
  • rtpg 13y ago
    adding vendor prefixes isn't free. with Dart it's only one extra command to run. With prefixes, you have to keep track of all the usages.
    • pcwalton 13y ago
      Sass, Less, or Myth add all the prefixes. It's only one extra command to run.