Dmitry Gozman 7fe7d0ef32
feat(snapshots): make cssom overrides efficient (#5218)
- Intercept CSSOM modifications and recalculate overridden css text.
- When css text does not change, use "backwards reference" similar
  to node references.
- Set 'Cache-Control: no-cache' for resources that could be overridden.
2021-01-29 15:24:38 -08:00
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