Add iframe experiment

csswizardry · csswizardry · commit 3cd5f6a58153 · 2025-08-20T12:55:43.000+01:00
diff --git a/iframe.html b/iframe.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<html lang=en-gb>
+  <meta charset=utf-8>
+  <meta name=viewport content="width=device-width, minimum-scale=1.0">
+
+  <title>preconecting iframes</title>
+
+  <link rel=preconnect href=https://harry.is>
+
+  <script>
+    function longTask(ms) {
+      const start = Date.now();
+      while (Date.now() - start <= ms) { true }
+      console.log('[Main] INP Long task complete.')
+    }
+
+    longTask(1000);
+  </script>
+
+  <h1><code>preconnecting</code> <code>iframe</code>s</h1>
+
+  <iframe src=https://harry.is/ loading=lazy></iframe>
