SELECT domain(url) as domainname, count(*) as num
WHERE lower(respOtherHeaders) contains "timing-allow-origin"
GROUP BY domainname
ORDER BY num desc
Relevant part of the spec: http://www.w3.org/TR/resource-timing/#cross-origin-resources
Sadly, basically nobody… as of mid 2013:
Wow, was totally not expecting that, is the header actually ratified now?
Yup, ResourceTiming is implemented in IE10+ and Chrome! Andy Davies did a nice writeup on it in WebPerf calendar: http://calendar.perfplanet.com/2012/an-introduction-to-the-resource-timing-api/