It doesn't seem particularly related as <title> has about the same percentage: https://caniuse.com/mdn-html_elements_title https://caniuse.com/mdn-html_elements

It doesn't seem particularly related as <title> has about the same percentage: https://caniuse.com/mdn-html_elements_title https://caniuse.com/mdn-html_elements_title. Rather it seems more to do with how it counts browsers it knows the usage of but doesn't have validation of support one way or the other for. Trivia: That HTML is actually invalid, <title> </title> gets treated as a blank title, which is not valid. If you change it to <title>.</title> or similar it should be error free though.