LinkTagHelper fallback test for HTML attributes #14104
Description
The Problem
I am trying to add a fallback for normalize.css but the normalize.css file doesn't contain any css classes, but attribute selectors.
The Solution
Adding an additional fallback test attribute to be able to test also attribute selectors.
Example:
asp-fallback-test-attribute would be the new additional attribute.
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.1/normalize.min.css"
asp-fallback-test-attribute="hidden"
asp-fallback-test-property="display"
asp-fallback-test-value="none"
asp-fallback-href="~/lib/normalize.min.css" />
should be rendered like this:
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.1/normalize.min.css"/>
<meta name="x-stylesheet-fallback-test" content="" class="" hidden>
<script>!function(a,b,c,d){var e,f=document,g=f.getElementsByTagName("SCRIPT"),h=g[g.length-1].previousElementSibling,i=f.defaultView&&f.defaultView.getComputedStyle?f.defaultView.getComputedStyle(h):h.currentStyle;if(i&&i[a]!==b)for(e=0;e<c.length;e++)f.write('<link href="'+c[e]+'" '+d+"/>")}("display","none",["\/lib\/normalize.min.css"], "rel=\u0022stylesheet\u0022 ");</script>