What is causing Visual Studio 2022 to flag the use of an unidentified CSS class property from Bootstrap?

I recently set up a new razor page web app template project in visual studio 2022.

As I started adding some bootstrap CSS classes, here is the HTML snippet that I used:

<form  method="get">
    <div class="form-group">
        <div class="input-group">
            <input type="text"  class="form-control" name="searchTerm"  value=""/>
            <span class="input-group-btn">
                <button class="btn btn-primary">
                    <i class="glyphicon glyphicon-search"></i>
                </button>
            </span>
        </div>
    </div>
</form>

The template automatically loads bootstrap in the layout page with these links:

<link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.min.css" />
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="42202d2d36313630233202766c74a6e78">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn"

crossorigin="anonymous"

Despite this setup, Visual Studio is showing errors for the classes like form-group, input-group-btn, and glyphicon glyphicon-search. Any ideas why?

csstwitter-bootstrapbootstrap-4

Answer №1

Have you ensured that the href value for your locally stored Bootstrap is accurate? When utilizing LibMan within Visual Studio, the default folder name for Bootstrap may vary – in my case, it's twitter-bootstrap rather than just bootstrap. This means that my href points to 

~/lib/twitter-bootstrap/css/bootstrap.min.css
.

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