frontend/content/pages.yaml

@@ -6,7 +6,7 @@ pages:
   about:
     title: "About Thermograph: how the weather grades are calculated"
     description: >-
-      How Thermograph works: ~45 years of ERA5 climate history, a ±7-day
+      How Thermograph works: ~45 years of ERA5 climate history, a ±7-day
       seasonal window, and empirical percentiles that grade each day relative to
       its own location.
   privacy:
@@ -21,7 +21,7 @@ pages:
       temperatures by month, all-time records, and how today's weather compares
       to local history.
   glossary_index:
-    title: "Weather & climate glossary: heat index, feels-like, percentile, and more"
+    title: "Weather & climate glossary: heat index, feels-like, percentile, and more"
     description: >-
       Plain-language definitions of weather and climate terms: climate normal,
       percentile, temperature anomaly, feels-like, heat index, wind chill,

frontend/server/internal/contentdata/loader_test.go

@@ -3,6 +3,7 @@ package contentdata
 import (
 	"os"
 	"path/filepath"
+	"regexp"
 	"testing"
 )
 
@@ -109,3 +110,38 @@ func TestLoadRealContentFiles(t *testing.T) {
 		}
 	}
 }
+
+// pages.yaml's title/description are interpolated as plain strings into
+// <title> and <meta name="description"> (base.html.tmpl), so html/template
+// escapes them. An HTML entity written in the YAML is therefore escaped a
+// second time and the user sees the literal source: "&plusmn;7-day" in the
+// SERP snippet, "Weather &amp; climate glossary" in the browser tab. Both
+// shipped live until this test existed.
+//
+// glossary.yaml's `body` is deliberately NOT checked: it is typed
+// template.HTML (see glossary_term.html.tmpl) and rendered raw, so entities
+// and <b> tags there are correct and must stay.
+func TestRealPagesHaveNoDoubleEscapedEntities(t *testing.T) {
+	dir := filepath.Join("..", "..", "..", "content")
+	if _, err := os.Stat(filepath.Join(dir, "pages.yaml")); err != nil {
+		t.Skipf("real content dir not available: %v", err)
+	}
+	pages, err := LoadPages(dir)
+	if err != nil {
+		t.Fatalf("LoadPages(real): %v", err)
+	}
+	// Named (&amp;), decimal (&#177;) and hex (&#xB1;) entity forms.
+	entity := regexp.MustCompile(`&([a-zA-Z][a-zA-Z0-9]*|#[0-9]+|#[xX][0-9a-fA-F]+);`)
+	for key, p := range pages {
+		for field, value := range map[string]string{
+			"title": p.Title, "description": p.Description,
+		} {
+			if m := entity.FindString(value); m != "" {
+				t.Errorf("pages.yaml[%s].%s contains the HTML entity %q; "+
+					"write the character literally (this field is escaped at "+
+					"render time, so the entity reaches the user as source)",
+					key, field, m)
+			}
+		}
+	}
+}