Hackers are using your website http://validator.w3.org/ from Romain C on 2020-11-22 (www-validator@w3.org from November 2020)
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Lars Wittenberg on X: "@LeaVerou Your svg code example will not work for me until I add "www" before the w3.org-URL. Chrome v80.0. 🧐 https://t.co/xegMUUsD03" / X
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The http://www.w3.org/1999/xhtml problem in WordPress Dashboard | by YIXUN | Medium
http://www.w3.org/1999/xhtml from Michael Featherby on 2009-10-28 (site-comments@w3.org from October 2009)
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