https://github.com/validator/validator/wiki/Markup-%C2%BB-Void-elements#trailing-slashes-in-void-element-start-tags-do-not-mark-the-start-tags-as-self-closing h

https://github.com/validator/validator/wiki/Markup-%C2%BB-Void-elements#trailing-slashes-in-void-element-start-tags-do-not-mark-the-start-tags-as-self-closing https://github.com/validator/validator/wiki/Markup-%C2%BB-Vo... https://github.com/validator/validator/wiki/Markup-%C2%BB-Void-elements#trailing-slashes-directly-preceded-by-unquoted-attribute-values https://github.com/validator/validator/wiki/Markup-%C2%BB-Vo... https://www.matsimon.dev/blog/to-close-or-not-to-close https://www.matsimon.dev/blog/to-close-or-not-to-close https://github.com/w3c/html/issues/737 https://github.com/w3c/html/issues/737 There's more.