In this example, we'll assume you have a Bootstrap3 and a Bootstrap4 template in the folders bs3/_Line.cshtml and the same in bs4/_Line.cshtml. We'll use Koi to load the right template file.
bs3/_Line.cshtml
bs4/_Line.cshtml
You can see in the source-codes that BS3 uses pull-left and another class on the blockquote tag than BS4.
pull-left
"this is awesome!"
Below you'll see the source code of the file. Note that we're just showing the main part, and hiding some parts of the file which are not relevant for understanding the essentials. Click to expand the code
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123456789@inherits Custom.Hybrid.Razor14<div class="alert alert-success pull-left" role="alert"> <h3>You are seeing the Bootstrap3 Template</h3> <blockquote class="blockquote-reverse"> "this is awesome!" </blockquote></div>XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
123456789@inherits Custom.Hybrid.Razor14<div class="alert alert-success float-left" role="alert"> <h3>You are seeing the Bootstrap4 Template</h3> <blockquote class="text-right"> "this is awesome!" </blockquote></div>XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX