diff --git a/src/scroll-timeline-css-parser.js b/src/scroll-timeline-css-parser.js
index b0a5eaf..1f4ada6 100644
--- a/src/scroll-timeline-css-parser.js
+++ b/src/scroll-timeline-css-parser.js
@@ -83,18 +83,30 @@ export class StyleParser {
         this.handleScrollTimelineProps(rule, p);
     }
 
-    // If this sheet has no srcURL (like from a <style> tag), we are done.
-    // Otherwise, we have to find `url()` functions and resolve
-    // relative URLs to absolute URLs.
+    return this.replaceUrlFunctions(p.sheetSrc, srcUrl);
+  }
+
+
+  // If this sheet has no srcURL (like from a <style> tag), we are done.
+  // Otherwise, we have to find `url()` functions and resolve
+  // relative and path-absolute URLs to absolute URLs.
+  replaceUrlFunctions(sheetSrc, srcUrl) {
     if (!srcUrl) {
-      return p.sheetSrc;
+      return sheetSrc;
     }
 
-    const srcUrlDir = srcUrl.lastIndexOf('/') > location.origin.length
+    const srcUrlOrigin = new URL(srcUrl).origin
+    const srcUrlDir = srcUrl.lastIndexOf('/') > srcUrlOrigin.length
         ? srcUrl.substring(0, srcUrl.lastIndexOf('/'))
-        : location.origin;
+        : srcUrlOrigin;
+
+    // replace relative paths
+    sheetSrc = sheetSrc.replace(/url\((?:(['"])(?!https?:\/\/|data:|blob:|\/)|(?!['"]?(?:https?:\/\/|data:|blob:|\/)))(?:\.\/)?/gm, `url($1${srcUrlDir}/`)
+
+    // replace path-absolute paths
+    sheetSrc = sheetSrc.replace(/url\((['"])?\//gm, `url($1${srcUrlOrigin}/`)
 
-    return p.sheetSrc.replace(/url\((["'])?(?:\.?\/|(?!https?:\/\/|(?:data|blob):))/gm, `url($1${srcUrlDir}/`);
+    return sheetSrc;
   }
 
   getAnimationTimelineOptions(animationName, target) {