As of June 20, 2025, this name is no longer defined by a Web Platform specification
Definition
Privacy-Preserving Attribution: Level 1 defines PrivateAttributionImpressionOptions
dictionary PrivateAttributionImpressionOptions {
required unsigned long histogramIndex;
unsigned long matchValue = 0;
sequence<USVString> conversionSites = [];
unsigned long lifetimeDays = 30;
};