fix: screen size shadowing, popstate double pageview, custom event self-referrals

CHANGELOG.md

@@ -10,6 +10,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 - **More accurate pageview counts.** Refreshing a page no longer inflates your pageview numbers. The tracking script now detects when the same page is loaded again within a few seconds and skips the duplicate, so metrics like total pageviews, pages per session, and visit duration reflect real navigation instead of reload habits.
 - **Self-referrals no longer pollute your traffic sources.** Internal navigation within your own site (e.g. clicking from your homepage to your about page) no longer shows your own domain as a referrer. Only external traffic sources appear in your Referrers panel now.
+- **Screen size fallback now works correctly.** A variable naming issue prevented the fallback screen dimensions from being read when the primary value wasn't available. Screen size data is now reliably captured on all browsers.
+- **Browser back/forward no longer double-counts pageviews.** Pressing the back or forward button could occasionally register two pageviews instead of one. The tracking script now correctly deduplicates these navigations.
 
 ## [0.15.0-alpha] - 2026-03-13
 

public/script.js

@@ -282,16 +282,16 @@
         referrer = rawReferrer;
       }
     }
-    const screen = {
-      width: window.innerWidth || screen.width,
-      height: window.innerHeight || screen.height,
+    const screenSize = {
+      width: window.innerWidth || window.screen.width,
+      height: window.innerHeight || window.screen.height,
     };
 
     const payload = {
       domain: domain,
       path: path,
       referrer: referrer,
-      screen: screen,
+      screen: screenSize,
       session_id: getSessionId(),
     };
 
@@ -354,6 +354,9 @@
 
   // * Track popstate (browser back/forward)
   window.addEventListener('popstate', function() {
+    var url = location.href;
+    if (url === lastUrl) return;
+    lastUrl = url;
     trackPageview();
     setTimeout(check404, 100);
     if (trackScroll) scrollFired = {};
@@ -373,7 +376,15 @@
       return;
     }
     var path = window.location.pathname + window.location.search;
-    var referrer = document.referrer || '';
+    var rawRef = document.referrer || '';
+    var referrer = '';
+    if (rawRef) {
+      try {
+        var rh = new URL(rawRef).hostname.replace(/^www\./, '');
+        var sh = domain.replace(/^www\./, '');
+        if (rh !== sh) referrer = rawRef;
+      } catch (e) { referrer = rawRef; }
+    }
     var screenSize = { width: window.innerWidth || 0, height: window.innerHeight || 0 };
     var payload = {
       domain: domain,