fix: judge a redirect page by its target

scripts/validate_site.py

@@ -41,6 +41,8 @@ class Page:
     empty_headers: int = 0
     runtime_diagrams: int = 0
     size: int = 0
+    # A moved page's old address: a meta refresh to the new one, no content.
+    redirect: str = ""
 
 
 # Budgets the site was brought under on 2026-10-22, with room to grow. A
@@ -90,6 +92,8 @@ class _PageParser(HTMLParser):
             self.page.lang = data.get("lang", "")
         elif tag == "title":
             self._title_depth += 1
+        elif tag == "meta" and data.get("http-equiv", "").lower() == "refresh":
+            self.page.redirect = data.get("content", "").partition("url=")[2]
         elif tag == "meta" and data.get("name", "").lower() == "description":
             self.page.descriptions.append(data.get("content", "").strip())
         elif tag == "h1":
@@ -347,7 +351,10 @@ def validate_site(site: Path, base_path: str = "/retrobios/") -> list[str]:
     titles: dict[str, list[Path]] = defaultdict(list)
     descriptions: dict[str, list[Path]] = defaultdict(list)
 
-    issues.extend(_check_pages(pages, site, titles, descriptions))
+    # A redirect has no page to judge, only a target. The link check below
+    # still follows its link, so a redirect to nowhere is reported.
+    content = {path: page for path, page in pages.items() if not page.redirect}
+    issues.extend(_check_pages(content, site, titles, descriptions))
 
     for label, values in (("title", titles), ("description", descriptions)):
         for value, paths in values.items():

tests/test_site_validation.py

@@ -149,6 +149,25 @@ class RenderedSiteValidation(unittest.TestCase):
         self.assertTrue(any("images missing alt" in issue for issue in issues))
         self.assertTrue(any("broken local link" in issue for issue in issues))
 
+    def test_a_redirect_is_judged_by_its_target(self):
+        """A moved page's old address holds only a meta refresh. It has no
+        title or landmark to check, but a target that is gone is reported."""
+        (self.site / "index.html").write_text(
+            _page("Home", "Unique home description."), encoding="utf-8"
+        )
+        for name, target in (("old", "/retrobios/"), ("lost", "/retrobios/gone/")):
+            folder = self.site / name
+            folder.mkdir()
+            (folder / "index.html").write_text(
+                f'<!doctype html><title>Redirecting to: {target}</title>'
+                f'<meta http-equiv="refresh" content="0;url={target}">'
+                f'<a href="{target}">Redirecting</a>',
+                encoding="utf-8",
+            )
+        issues = validate_site(self.site, self.config)
+        self.assertFalse([i for i in issues if "old/" in i], issues)
+        self.assertTrue(any("lost/" in i and "broken local link" in i for i in issues), issues)
+
     def test_duplicate_search_metadata_fails(self):
         (self.site / "index.html").write_text(
             _page("Repeated", "Repeated description."), encoding="utf-8"