Blink Engine Style Propagation and the kInherited Severity Class

The provided text explains the technical implementation of ComputedStyle::Difference::kInherited within Google’s Blink rendering engine. Rather than simply following CSS specifications, this system serves as a severity-based classification used to determine how style changes propagate from ancestors to descendants. The sources detail how Blink distinguishes between independent inheritance, which allows for a fast "patch" of style data, and the kInherited status that mandates a full style recalculation for child elements. This distinction is governed by a complex decision tree involving generated metadata, handwritten overrides for properties like text decoration, and special handling for CSS variables. Ultimately, the system ensures efficiency by only triggering expensive restyling operations when a descendant’s computed style cannot be safely repaired through simple propagation.