Implemented phase 0 for the POC prototype in the Website service.

Services/Website/Tests/Library/Cases/Internal/Pages/IndexPageTests.swift

@@ -27,16 +27,47 @@ struct IndexPageTests {
         #expect(html.contains("/apple-touch-icon.png"))
         #expect(html.contains("/site.webmanifest"))
         #expect(html.contains(#"media="(prefers-color-scheme: dark)""#))
-        #expect(html.contains("Hello world!"))
+        #expect(html.contains("Back issues, from shops you can vet first."))
         #expect(html.contains("/js/shared.js"))
         #expect(html.contains("/js/index.js"))
     }
 
     @Test
-    func `renders no font preloads until fonts are declared`() {
-        // The template ships no fonts, so a preload link here would point at a file the service does not serve.
-        #expect(IndexPage.preloadedFonts.isEmpty)
-        #expect(!IndexPage(locale: .init(identifier: "en")).render().contains(#"rel="preload""#))
+    func `renders the site frame around its content`() {
+        let html = IndexPage(
+            locale: .init(identifier: "en")
+        ).render()
+
+        #expect(html.contains(#"class="skip-link""#))
+        #expect(html.contains(#"class="site-header""#))
+        #expect(html.contains(#"<main id="main">"#))
+        #expect(html.contains(#"class="site-footer""#))
+    }
+
+    @Test
+    func `renders no inline styles`() {
+        // The Content-Security-Policy is `default-src 'self'`, which blocks `style` attributes and elements alike.
+        let html = IndexPage(
+            locale: .init(identifier: "en")
+        ).render()
+
+        #expect(!html.contains("style="))
+        #expect(!html.contains("<style"))
+    }
+
+    @Test
+    func `preloads every font face unversioned`() {
+        // A preload URL must match the stylesheet's `@font-face` source exactly, or the browser fetches the font twice.
+        let html = IndexPage(
+            locale: .init(identifier: "en"),
+            assetVersion: "0123456789abcdef"
+        ).render()
+
+        #expect(IndexPage.preloadedFonts.count == 3)
+
+        for font in IndexPage.preloadedFonts {
+            #expect(html.contains(#"<link rel="preload" href="\#(font.urlPath(for: .woff2))" as="font""#))
+        }
     }
 
     @Test