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https://validator.w3.org/ --> http://altsheets.ddns.net/d3/animatelogo/ so https://validator.w3.org/check?uri=http%3A%2F%2Faltsheets.ddns.net%2Fd3%2Fanimatelogo%2F&charset=%28detect+automatically%29 (you have to reload 2-3 times, something's wrong with the ddns.net?) ... anyway it ... Says Error found while checking this document as XHTML 1.0 Transitional! Line 57, Column 13: character "<" is the first character of a delimiter but occurred as data for (i=0; i < numberOfSVGs; i++){ but that is a < inside a javascript.