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window.performance.eventCounts＝ ／[Edge]

size[number]＝36

entries[function]＝function entries() { [native code] }

forEach[function]＝function forEach() { [native code] }

get[function]＝function get() { [native code] }

has[function]＝function has() { [native code] }

keys[function]＝function keys() { [native code] }

values[function]＝function values() { [native code] }