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Adds X-Frame-Options and CSP frame-ancestors headers to prevent this site from being embedded in an iframe on other domains. X-Frame-Options is the legacy header; frame-ancestors is the modern CSP equivalent. Both are set for maximum browser compatibility. See 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.