Add a first line in the file “https://github.com/getkirby/demokit/blob/master/site/snippets/header.php”:
<!DOCTYPE html>
It is missing for a standard compliant html.
Add a first line in the file “https://github.com/getkirby/demokit/blob/master/site/snippets/header.php”:
<!DOCTYPE html>
It is missing for a standard compliant html.
The same error can be found at https://github.com/getkirby/demokit/blob/master/site/plugins/blog/snippets/header.php .