diff --git a/index.html b/index.html
index 2a8aceb1..b5f56160 100644
--- a/index.html
+++ b/index.html
@@ -9278,7 +9278,7 @@
         if(url.length>200||url.includes('{')|| url.includes('"'))return null;
         var m=url.match(/^(?:https?:\/\/)?(?:www\.)?github\.com\/([a-zA-Z0-9_.-]+)\/([a-zA-Z0-9_.-]+)/);
         if(m)return{owner:m[1],repo:m[2].replace(/\.git$/,'')};
-        var simple=url.match(/^([a-zA-Z0-9_.-]+)\/([a-zA-Z0-9_.-]+)$/);
+        var simple=url.match(/^([a-zA-Z0-9_.-]+)\/([a-zA-Z0-9_.-]+)\/?$/);
         if(simple)return{owner:simple[1],repo:simple[2]};
         return null;
     }
diff --git a/tests/parse-url.test.mjs b/tests/parse-url.test.mjs
new file mode 100644
index 00000000..e2a65b02
--- /dev/null
+++ b/tests/parse-url.test.mjs
@@ -0,0 +1,58 @@
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import test from 'node:test';
+import vm from 'node:vm';
+
+// parseUrl runs in a separate vm context (different realm), so objects it
+// returns are not `instanceof` this realm's Object — deepStrictEqual would
+// fail on that alone. Compare plain field values instead.
+function assertParsed(actual, expectedOwner, expectedRepo) {
+  assert.ok(actual, `expected a parsed result, got ${actual}`);
+  assert.equal(actual.owner, expectedOwner);
+  assert.equal(actual.repo, expectedRepo);
+}
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const repoRoot = join(__dirname, '..');
+const htmlSource = await readFile(join(repoRoot, 'index.html'), 'utf8');
+
+const fnStart = htmlSource.indexOf('function parseUrl(url){');
+if (fnStart < 0) {
+  throw new Error('Could not locate parseUrl() in index.html');
+}
+const fnEnd = htmlSource.indexOf('\n    }', fnStart) + '\n    }'.length;
+const fnSource = htmlSource.slice(fnStart, fnEnd);
+
+const context = { console };
+vm.createContext(context);
+vm.runInContext(`${fnSource}\nthis.parseUrl = parseUrl;`, context);
+const { parseUrl } = context;
+
+test('parseUrl accepts the bare owner/repo shorthand', () => {
+  assertParsed(parseUrl('facebook/react'), 'facebook', 'react');
+});
+
+test('parseUrl accepts owner/repo with a trailing slash', () => {
+  assertParsed(parseUrl('facebook/react/'), 'facebook', 'react');
+});
+
+test('parseUrl still rejects owner/repo with extra path segments', () => {
+  assert.equal(parseUrl('facebook/react/extra'), null);
+});
+
+test('parseUrl accepts a full GitHub URL with a trailing slash', () => {
+  assertParsed(parseUrl('https://github.com/facebook/react/'), 'facebook', 'react');
+});
+
+test('parseUrl strips .git suffix from full GitHub URLs', () => {
+  assertParsed(parseUrl('https://github.com/facebook/react.git'), 'facebook', 'react');
+});
+
+test('parseUrl rejects garbage input', () => {
+  assert.equal(parseUrl(''), null);
+  assert.equal(parseUrl(null), null);
+  assert.equal(parseUrl('not a repo'), null);
+  assert.equal(parseUrl('{"owner":"x"}/repo'), null);
+});