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Sorry, didn't know what component or severity to use. HTML5 validation fails when a style element contains html comments and the following text: "empty-" (as in the CSS property "empty-cells". The following is a valid document that will fail: <!DOCTYPE html> <html> <head> <meta charset="UTF-8"/> <title>Christina Hardyment - Author and Journalist</title> <style> <!-- table { empty-cells:hide } --> </style> </head> <body> </body> </html>
The example document no longer fails, so I'm assuming this has been fixed at some point.