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Sets frame-ancestors property to none to prevent nesting this site in an iframe. Although we already set X-Frame-Options to deny, this is the modern CSP method for declaring this setting. Sees letsencrypt/website#1080 and letsencrypt/website#2148.
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Adds X-Frame-Options (legacy header) and CSP frame-ancestors (modern CSP equivalent) headers to prevent this site from being embedded in an iframe on other domains. See letsencrypt/website#1080 and letsencrypt/website#2148.