The Platform for Privacy Preferences Project (P3P) is an obsolete protocol allowing websites to declare their intended use of information they collect about web browser users. Designed to give users more control of their personal information when browsing, P3P was developed by the World Wide Web Consortium (W3C) and officially recommended on April 16, 2002. Development ceased shortly thereafter and there have been very few implementations of P3P. Microsoft Internet Explorer and Edge were the only major browsers to support P3P. Microsoft has ended support from Windows 10 onwards. Microsoft Internet Explorer and Edge on Windows 10 will no longer support P3P. The president of TRUSTe has stated that P3P has not been implemented widely due to the difficulty and lack of value.
