How many (and which) pages are in quirks mode?

Analysis
1 
SELECT url, doctype FROM (
  SELECT
    url,
    JSON_EXTRACT(payload, '$._quirks_mode') AS quirks,
    JSON_EXTRACT(payload, '$._doctype') AS doctype
  FROM [httparchive:har.2016_06_01_chrome_pages]
)
WHERE quirks != "false"
ORDER BY doctype

~7.4% of total pages.

Results at https://gist.github.com/zcorpan/1c2fd8b55133c0e6f4892243c87b2d0a