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In order to define charset for HTML5 Doctype, which notation should I use?

1. Short:

   <meta charset="utf-8" /> 
   

2. Long:

   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
   

In HTML5, they are equivalent. Use the shorter one, as it is easier to remember and type. Browser support is fine since it was designed for backwards compatibility.