Meta http-equiv
16,540,472 websites

Meta http-equiv is free to use

http://www.w3schools.com/tags/att_meta_http_equiv.asp

The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.

VS

P3P Policy
2,537,460 websites

P3P Policy is free to use

http://www.w3.org/P3P/

The Platform for Privacy Preferences Project (P3P) enables Websites to express their privacy practices in a standard format that can be retrieved automatically and interpreted easily by user agents. P3P user agents will allow users to be in...

Market Share by Top Websites

1 Meta http-equiv is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, P3P Policy is clearly lagging behind, losing to Meta http-equiv in all segments.

Websites Categories

1 Meta http-equiv has better usage coverage in more websites categories. Including Computers Electronics & Technology, Science & Education, Arts & Entertainment, Games and 20 other categories.

2 P3P Policy hasn't got a lead over Meta http-equiv in any websites category.

Geography

1 Meta http-equiv is leading in most countries, including United States, Japan, China, Russia and 162 other countries.

2 P3P Policy hasn't got a lead over Meta http-equiv in any country.