pub fn drain_css_prop_counts() -> Vec<(&'static str, usize)>Expand description
Drain the per-thread CSS cascade-walk counter populated by
CssPropertyCache::get_property when AZ_PROP_COUNT=1 is set
in the environment. Returns (property_label, count) pairs
sorted by count descending. Layout-side instrumentation calls
this after each layout_document to print which properties
drove the most cascade walks.