diff --git a/src/Mvc/ViewCompilation/test/FunctionalTests/Resources/SimpleAppTest.Home.Index.txt b/src/Mvc/ViewCompilation/test/FunctionalTests/Resources/SimpleAppTest.Home.Index.txt
index afba35a9ea..fe83fc7f9d 100644
--- a/src/Mvc/ViewCompilation/test/FunctionalTests/Resources/SimpleAppTest.Home.Index.txt
+++ b/src/Mvc/ViewCompilation/test/FunctionalTests/Resources/SimpleAppTest.Home.Index.txt
@@ -7,7 +7,7 @@
 
     
     
-        <link rel="stylesheet" href="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.6/css/bootstrap.min.css" />
+        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" />
 <meta name="x-stylesheet-fallback-test" content="" class="sr-only" /><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+"/>")}("position","absolute",["\/lib\/bootstrap\/dist\/css\/bootstrap.min.css"], "rel=\u0022stylesheet\u0022 ");</script>
         <link rel="stylesheet" href="/css/site.min.css" />
     
@@ -153,13 +153,13 @@ SimpleApp.PrecompiledViews, Version=1.0.0.0, Culture=neutral, PublicKeyToken=nul
         <script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-2.2.0.min.js">
         </script>
 <script>(window.jQuery||document.write("\u003Cscript src=\u0022\/lib\/jquery\/dist\/jquery.min.js\u0022\u003E\u003C\/script\u003E"));</script>
-        <script src="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.6/bootstrap.min.js">
+        <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js">
         </script>
 <script>(window.jQuery && window.jQuery.fn && window.jQuery.fn.modal||document.write("\u003Cscript src=\u0022\/lib\/bootstrap\/dist\/js\/bootstrap.min.js\u0022\u003E\u003C\/script\u003E"));</script>
         <script src="/js/site.min.js"></script>
-    
 
-    
+
+
     SimpleApp.PrecompiledViews, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
 </body>
 </html>
diff --git a/src/Mvc/ViewCompilation/testassets/SimpleApp/Views/Shared/_Layout.cshtml b/src/Mvc/ViewCompilation/testassets/SimpleApp/Views/Shared/_Layout.cshtml
index 4ec1363ad9..e344ef0558 100644
--- a/src/Mvc/ViewCompilation/testassets/SimpleApp/Views/Shared/_Layout.cshtml
+++ b/src/Mvc/ViewCompilation/testassets/SimpleApp/Views/Shared/_Layout.cshtml
@@ -10,7 +10,7 @@
         <link rel="stylesheet" href="~/css/site.css" />
     </environment>
     <environment names="Staging,Production">
-        <link rel="stylesheet" href="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.6/css/bootstrap.min.css"
+        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
               asp-fallback-href="~/lib/bootstrap/dist/css/bootstrap.min.css"
               asp-fallback-test-class="sr-only" asp-fallback-test-property="position" asp-fallback-test-value="absolute" />
         <link rel="stylesheet" href="~/css/site.min.css" asp-append-version="true" />
@@ -55,7 +55,7 @@
                 asp-fallback-src="~/lib/jquery/dist/jquery.min.js"
                 asp-fallback-test="window.jQuery">
         </script>
-        <script src="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.6/bootstrap.min.js"
+        <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"
                 asp-fallback-src="~/lib/bootstrap/dist/js/bootstrap.min.js"
                 asp-fallback-test="window.jQuery && window.jQuery.fn && window.jQuery.fn.modal">
         </script>
diff --git a/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/RazorPagesWeb-CSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css b/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/RazorPagesWeb-CSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
index 8f4758923a..3f1a42084c 100644
--- a/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/RazorPagesWeb-CSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
+++ b/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/RazorPagesWeb-CSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
@@ -138,14 +138,14 @@ small {
 
 sub,
 sup {
-  position: relative;
   font-size: 75%;
   line-height: 0;
+  position: relative;
   vertical-align: baseline;
 }
 
 sub {
-  bottom: -.25em;
+  bottom: -0.25em;
 }
 
 sup {
@@ -305,6 +305,7 @@ fieldset {
   padding: 0;
   margin: 0;
   border: 0;
+  padding: 0;
 }
 
 legend {
diff --git a/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-CSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css b/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-CSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
index 8f4758923a..3f1a42084c 100644
--- a/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-CSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
+++ b/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-CSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
@@ -138,14 +138,14 @@ small {
 
 sub,
 sup {
-  position: relative;
   font-size: 75%;
   line-height: 0;
+  position: relative;
   vertical-align: baseline;
 }
 
 sub {
-  bottom: -.25em;
+  bottom: -0.25em;
 }
 
 sup {
@@ -305,6 +305,7 @@ fieldset {
   padding: 0;
   margin: 0;
   border: 0;
+  padding: 0;
 }
 
 legend {
diff --git a/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-FSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css b/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-FSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
index 8f4758923a..3f1a42084c 100644
--- a/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-FSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
+++ b/src/Templating/src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-FSharp/wwwroot/lib/bootstrap/dist/css/bootstrap.css
@@ -138,14 +138,14 @@ small {
 
 sub,
 sup {
-  position: relative;
   font-size: 75%;
   line-height: 0;
+  position: relative;
   vertical-align: baseline;
 }
 
 sub {
-  bottom: -.25em;
+  bottom: -0.25em;
 }
 
 sup {
@@ -305,6 +305,7 @@ fieldset {
   padding: 0;
   margin: 0;
   border: 0;
+  padding: 0;
 }
 
 legend {