diff --git a/examples/jotdown_wasm/demo.html b/examples/jotdown_wasm/demo.html
index ba7679b..2a028d2 100644
--- a/examples/jotdown_wasm/demo.html
+++ b/examples/jotdown_wasm/demo.html
@@ -21,7 +21,10 @@
             output.innerText = jotdown_render(input.innerText);
         } else if (fmt.value == "events") {
             output.classList.add("verbatim")
-            output.innerText = jotdown_parse(input.innerText);
+            output.innerText = jotdown_parse(input.innerText, false);
+        } else if (fmt.value == "events_spans") {
+            output.classList.add("verbatim")
+            output.innerText = jotdown_parse(input.innerText, true);
         } else if (fmt.value == "events_indent") {
             output.classList.add("verbatim")
             output.innerText = jotdown_parse_indent(input.innerText);
@@ -50,6 +53,7 @@
         <option value="preview">preview</option>
         <option value="html">html</option>
         <option value="events">events</option>
+        <option value="events_spans">events (with offsets)</option>
         <option value="events_indent">events (indented)</option>
       </select>
     </div>
diff --git a/examples/jotdown_wasm/src/lib.rs b/examples/jotdown_wasm/src/lib.rs
index 9aeb866..4d6d4e8 100644
--- a/examples/jotdown_wasm/src/lib.rs
+++ b/examples/jotdown_wasm/src/lib.rs
@@ -22,10 +22,16 @@ pub fn jotdown_render(djot: &str) -> String {
 
 #[must_use]
 #[wasm_bindgen]
-pub fn jotdown_parse(djot: &str) -> String {
-    jotdown::Parser::new(djot)
-        .map(|e| format!("{:?}\n", e))
-        .collect()
+pub fn jotdown_parse(djot: &str, spans: bool) -> String {
+    let mut out = String::new();
+    for (e, sp) in jotdown::Parser::new(djot).into_offset_iter() {
+        write!(out, "{:?}", e).unwrap();
+        if spans {
+            write!(out, " {:?} {:?}", &djot[sp.clone()], sp).unwrap();
+        }
+        writeln!(out).unwrap();
+    }
+    out
 }
 
 #[must_use]