.NET LinkTagHelper - how can I use it for CSS CDN files without explicit css class selectors?

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.NET LinkTagHelper - how can I use it for CSS CDN files without explicit css class selectors?



I have a .NET Core 2.1 app and in it I am pulling a few resources from CDN's via the "LinkTagHelper" .NET helper.



I started with an obvious example (that works just fine) like this:


<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css"
integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin="anonymous"
asp-fallback-href="~/lib/dist/css/bootstrap.min.css"
asp-fallback-test-class="sr-only"
asp-fallback-test-property="position"
asp-fallback-test-value="absolute" />



Now that's all good, Fallback works (if needed) CSS "sr-only" class is tested for presence and correctness.



I am also trying to do the same thing for this CSS file on their CDN:


<link rel="stylesheet"
href="https://cdn.datatables.net/1.10.19/css/dataTables.bootstrap4.min.css"
integrity="sha384-EkHEUZ6lErauT712zSr0DZ2uuCmi3DoQj6ecNdHQXpMpFNGAQ48WjfXCE5n20W+R"
crossorigin="anonymous"
asp-fallback-href="~/lib/dist/css/dataTables.bootstrap4.min.css"
asp-fallback-test-class=".dataTable"
asp-fallback-test-property="clear"
asp-fallback-test-value="both" />



Now in that example above, the test css class, property and value options in place are wrong - they do not work, so the fallback is always loaded. I wonder if it's because in the dataTables css file (here is the un-minified version), there is no "class only" selector specified, they are all type + class.



So, I suspect that I can't do what I want here because I can't choose an appropriate CSS selector to use in the LinkTagHelper! If it's always going to fall back, then I may as well not have the CDN.



Am I using LinkTagHelper wrong, or otherwise not thinking about this properly?



(I know I can just always load it from my site and not bother with these shennanigans, but... if I'm doing CDN for one library, may as well be consistent).









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