How to use JavaScript or jQuery to wrap a range (from selection) in a web page into a specific tag? -

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So I have to find a way to wrap some range in a specific tag using javascript or jQuery.

For example: 

  & lt; P & gt; Hey how are you? & Lt; / P & gt; & Lt; P & gt; I am good! & Lt; / P & gt;   
 Then use the JavaScript code in the console:  
  & lt; P & gt; This is & lt; Mytag & gt; How are you? & Lt; / P & gt; & Lt; P & gt; I & lt; / Mytag> good! & Lt; / P & gt;   
 I know how to get a limit from a selection, but I have to find a way to wrap this category.  
 Thank you!   
 
 
 You can tag the desired area in this way:  
  HTML     & lt; P & gt; Hey how are you? & Lt; / P & gt; & Lt; P & gt; I am good! & Lt; / P & gt; & Lt; P & gt; This is & lt; Span class = "mytag" & gt; How are you? & Lt; / Span & gt; & Lt; / P & gt; & Lt; P & gt; & Lt; Span class = "mytag" & gt; I & lt; / Span & gt; & Lt; / Mytag> good! & Lt; / P & gt;   
  Javascript   
  (function () {var test = ''; $ ('. Mytag'). Function (index) {test + = $ (.) .text ();}); // Use the test to be used}};

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