1 files changed, 49 insertions, 0 deletions

diff --git a/toc.js b/toc.js
new file mode 100644
index 0000000..633088a
--- /dev/null
+++ b/toc.js
@@ -0,0 +1,49 @@
+document.addEventListener("DOMContentLoaded", () => {
+    var tocDiv = document.createElement("div");
+    tocDiv.classList += "toc";
+    var toc = document.createElement("ul");
+
+    document.body.querySelectorAll('h1, h2, h3, h4, h5, h6').forEach(heading => {
+        var link = document.createElement('a');
+        link.setAttribute('href', '#'+heading.id.toLowerCase());
+        link.textContent = heading.textContent;
+        
+        var li = document.createElement('li');
+        li.appendChild(link);
+        
+        toc.appendChild(li);
+    });
+
+    tocDiv.append(toc);
+    document.body.prepend(tocDiv);
+
+    var styleBlock = document.createElement("style");
+    styleBlock.textContent = `
+        .toc {
+            position: fixed;
+            width: 17rem;
+            top: 32px;
+            left: calc(50vw - 37.5ch - 20rem);
+            padding-right: 0.75rem;
+            z-index: 1;
+
+            ul {
+                margin: 0;
+                padding-left: 1rem;
+                line-height: 1.4;
+            }
+
+            li {
+                margin-bottom: 0.35rem;
+                font-size: 1.1rem;
+            }
+        }
+
+        @media (max-width: 1000px) {
+            .toc {
+                display: none;
+            }
+        }
+    `;
+    document.head.append(styleBlock);
+})
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