SSL Certificates

HSTSHSTS

HSTS Usage Statistics · Download List of All Websites using HSTS

Forces browsers to only communicate with the site using HTTPS.

Web Servers

nginxnginx

nginx Usage Statistics · Download List of All Websites using nginx

nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.

Document Standards

HTML5 DocTypeHTML5 DocType

HTML5 DocType Usage Statistics

The DOCTYPE is a required preamble for HTML5 websites.

IFrameIFrame

IFrame Usage Statistics

The page shows content with an iframe; an embedded frame that loads another webpage.

Strict Transport SecurityStrict Transport Security

Strict Transport Security Usage Statistics

The HTTP Strict-Transport-Security (HSTS) header instructs the browser to only use https.