From c1e28224aa2e1450031669d9a7e359b63e04687d Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Wed, 22 Jul 2026 19:40:59 +0200
Subject: Init

---
 src/scripts/lib/toc.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 src/scripts/lib/toc.ts

(limited to 'src/scripts/lib/toc.ts')

diff --git a/src/scripts/lib/toc.ts b/src/scripts/lib/toc.ts
new file mode 100644
index 0000000..958f209
--- /dev/null
+++ b/src/scripts/lib/toc.ts
@@ -0,0 +1,14 @@
+export function mountToc() {
+	const observer = new IntersectionObserver((entries) => {
+		for (const entry of entries) {
+			const id = entry.target.getAttribute("id");
+			document
+				.querySelector(`.o-toc__item[href="#${id}"]`)
+				?.classList.toggle("is-selected", entry.intersectionRatio > 0);
+		}
+	});
+
+	document.querySelectorAll("section[id]").forEach((section) => {
+		observer.observe(section);
+	});
+}
-- 
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