The doctype is optional, but recommended, because it tells your browser to read it as HTML5 only. If you don't add it some browsers may try to read it as HTML4 or something and display unexpected ...
When using [HTML5 ASP.NET MVC Report Viewer]({%slug telerikreporting/using-reports-in-applications/display-reports-in-applications/web-application/html5-asp.net-mvc ...
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