https://validator.w3.org/
https://html5.validator.nu/
https://www.w3schools.com/
https://www.w3schools.com/browsers/browsers_stats.asp
https://www.alvit.de/handbook/
https://www.devside.net/
https://www.w3.org/
https://www.apache.org/
https://www.flossuk.org/
(Rebranded https://www.ukuug.org/
)https://addons.mozilla.org/en-US/firefox/extensions/
https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
https://www.ietf.org/rfc/rfc2616.txt
https://www.faqs.org/docs/Linux-HOWTO/SSL-Certificates-HOWTO.html
https://www.moserware.com/2009/06/first-few-milliseconds-of-https.html
https://github.com/overlib/overlib
The original site https://www.bosrup.com/web/overlib/
no longer exists.https://jigsaw.w3.org/css-validator/
https://www.csszengarden.com/
https://httpd.apache.org/info/css-security/
https://en.wikipedia.org/wiki/Cross-site_scripting
https://bobby-tables.com/about.html
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