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Latest W3C Markup Validation Service user agents:
User agent
W3C_Validator/1.3
W3C_Validator/1.305.2.12 libwww-perl/5.64
W3C_Validator/1.767
W3C_Validator/1.654
W3C_Validator/1.3 http://validator.w3.org/services
Validator.nu/LV http://validator.w3.org/services
Validator.nu/LV