fix(browser,cdp): correct document lifecycle ordering and add missing DOM methods

document.readyState was hardcoded to "complete" so scripts checking
readyState === 'loading' always took the wrong branch. Fixed by using a
JS global (__documentReadyState__) that Rust sets to "loading" before
any scripts execute, "interactive" before DOMContentLoaded fires, and
"complete" after load.

document.addEventListener and document.dispatchEvent on Document were
no-ops, so DOMContentLoaded listeners registered by inline scripts were
never called. Added proper listener storage and dispatch on Document.

Adds document.getElementsByName() (was missing entirely).

Page.reload is now implemented (re-navigates to the current URL),
resolving "Unknown Page method: reload" errors from Playwright.

data: URL navigation now works, fixing Playwright's goto("data:text/html,...")
pattern that previously errored with "invalid format".

Page.navigate logic extracted into do_navigate() so reload can reuse it.

Fixes #137, #146 (SPA bootstrap lifecycle ordering).

crates/obscura-browser/Cargo.toml

@@ -18,3 +18,4 @@ tracing = { workspace = true }
 thiserror = { workspace = true }
 anyhow = { workspace = true }
 serde_json = { workspace = true }
+base64 = { workspace = true }

crates/obscura-browser/src/page.rs

@@ -1,5 +1,6 @@
 use std::sync::Arc;
 
+use base64::{engine::general_purpose::STANDARD as BASE64, Engine as _};
 use obscura_dom::{parse_html, DomTree};
 use obscura_js::runtime::ObscuraJsRuntime;
 use obscura_net::{ObscuraHttpClient, ObscuraNetError, Response};
@@ -8,6 +9,48 @@ use url::Url;
 use crate::context::BrowserContext;
 use crate::lifecycle::LifecycleState;
 
+fn decode_data_uri(uri: &str) -> Option<Vec<u8>> {
+    let rest = uri.strip_prefix("data:")?;
+    let comma = rest.find(',')?;
+    let meta = &rest[..comma];
+    let payload = &rest[comma + 1..];
+    if meta.split(';').any(|t| t.eq_ignore_ascii_case("base64")) {
+        let cleaned: String = payload.chars().filter(|c| !c.is_whitespace()).collect();
+        BASE64.decode(cleaned).ok()
+    } else {
+        Some(percent_decode(payload))
+    }
+}
+
+fn percent_decode(s: &str) -> Vec<u8> {
+    let mut out = Vec::with_capacity(s.len());
+    let b = s.as_bytes();
+    let mut i = 0;
+    while i < b.len() {
+        if b[i] == b'%' && i + 2 < b.len() {
+            let hi = hex_val(b[i + 1]);
+            let lo = hex_val(b[i + 2]);
+            if let (Some(h), Some(l)) = (hi, lo) {
+                out.push((h << 4) | l);
+                i += 3;
+                continue;
+            }
+        }
+        out.push(b[i]);
+        i += 1;
+    }
+    out
+}
+
+fn hex_val(b: u8) -> Option<u8> {
+    match b {
+        b'0'..=b'9' => Some(b - b'0'),
+        b'a'..=b'f' => Some(b - b'a' + 10),
+        b'A'..=b'F' => Some(b - b'A' + 10),
+        _ => None,
+    }
+}
+
 #[cfg(feature = "stealth")]
 use obscura_net::StealthHttpClient;
 
@@ -364,6 +407,13 @@ impl Page {
             }
         }
 
+        // Spec: readyState is "loading" while parser-discovered scripts execute.
+        // Scripts that check readyState === 'loading' will register DOMContentLoaded
+        // listeners instead of calling their callback immediately.
+        if let Some(js) = &mut self.js {
+            let _ = js.execute_script("<ready-state>", "globalThis.__documentReadyState__ = 'loading';");
+        }
+
         for (i, script) in all_to_execute.iter().enumerate() {
             if script.src.is_some() {
                 if let Some((url, code, resp)) = fetched.remove(&i) {
@@ -417,10 +467,15 @@ impl Page {
         }
 
         if let Some(js) = &mut self.js {
+            // Spec order: readyState -> interactive, fire DOMContentLoaded on both
+            // document and window, then readyState -> complete, fire load.
             let _ = js.execute_script("<load-events>",
-                "if (typeof window.onload === 'function') { try { window.onload(); } catch(e) {} }\n\
-                 try { document.dispatchEvent(new Event('DOMContentLoaded')); } catch(e) {}\n\
-                 try { window.dispatchEvent(new Event('load')); } catch(e) {}");
+                "globalThis.__documentReadyState__ = 'interactive';\n\
+                 try { document.dispatchEvent(new Event('DOMContentLoaded', {bubbles:false,cancelable:false})); } catch(e) {}\n\
+                 try { window.dispatchEvent(new Event('DOMContentLoaded', {bubbles:false,cancelable:false})); } catch(e) {}\n\
+                 if (typeof window.onload === 'function') { try { window.onload(); } catch(e) {} }\n\
+                 globalThis.__documentReadyState__ = 'complete';\n\
+                 try { window.dispatchEvent(new Event('load', {bubbles:false,cancelable:false})); } catch(e) {}");
         }
 
         if let Some(js) = &mut self.js {
@@ -556,7 +611,18 @@ impl Page {
             }
         }
 
-        let response = if method == "POST" {
+        let response = if url.scheme() == "data" {
+            let content_type = url_str.strip_prefix("data:")
+                .and_then(|s| s.split(',').next())
+                .unwrap_or("text/html")
+                .split(';').next()
+                .unwrap_or("text/html")
+                .to_string();
+            let body_bytes = decode_data_uri(url_str).unwrap_or_default();
+            let mut headers = std::collections::HashMap::new();
+            headers.insert("content-type".to_string(), content_type);
+            Ok(obscura_net::Response { url: url.clone(), status: 200, headers, body: body_bytes, redirected_from: Vec::new() })
+        } else if method == "POST" {
             self.http_client.post_form(&url, body).await
         } else {
             self.do_fetch(&url).await

crates/obscura-cdp/src/domains/page.rs

@@ -5,6 +5,154 @@ use crate::dispatch::CdpContext;
 use crate::types::CdpEvent;
 use crate::util::url_is_file_scheme;
 
+async fn do_navigate(
+    url: &str,
+    params: &Value,
+    ctx: &mut CdpContext,
+    session_id: &Option<String>,
+) -> Result<Value, String> {
+    let wait_until = params.get("waitUntil")
+        .and_then(|v| {
+            if let Some(s) = v.as_str() {
+                Some(WaitUntil::from_str(s))
+            } else if let Some(arr) = v.as_array() {
+                arr.iter()
+                    .filter_map(|item| item.as_str())
+                    .map(WaitUntil::from_str)
+                    .max_by_key(|w| match w {
+                        WaitUntil::DomContentLoaded => 0,
+                        WaitUntil::Load => 1,
+                        WaitUntil::NetworkIdle2 => 2,
+                        WaitUntil::NetworkIdle0 => 3,
+                    })
+            } else {
+                None
+            }
+        })
+        .unwrap_or(WaitUntil::Load);
+
+    // Block CDP-initiated file:// navigation by default.
+    // Anyone who can reach the CDP port (default localhost,
+    // but Docker images bind 0.0.0.0) could otherwise read
+    // any file the obscura process can read. Opt in via
+    // `obscura serve --allow-file-access` when local-HTML
+    // testing is the intended workflow.
+    if url_is_file_scheme(url) && !ctx.default_context.allow_file_access {
+        return Err(
+            "Page.navigate to file:// is disabled. Restart with `obscura serve --allow-file-access` to enable.".to_string()
+        );
+    }
+
+    let preload_scripts: Vec<String> = ctx.preload_scripts.iter().map(|(_, s)| s.clone()).collect();
+
+    let (frame_id, loader_id, network_events, page_url, page_id, reached_network_idle) = {
+        let page = ctx.get_session_page_mut(session_id).ok_or("No page for session")?;
+        let frame_id = page.frame_id.clone();
+        let loader_id = format!("loader-{}", uuid::Uuid::new_v4());
+
+        let nav_method = params.get("__method").and_then(|v| v.as_str()).unwrap_or("GET");
+        let nav_body = params.get("__body").and_then(|v| v.as_str()).unwrap_or("");
+        if nav_method == "POST" && !nav_body.is_empty() {
+            page.navigate_with_wait_post(url, wait_until, nav_method, nav_body).await.map_err(|e| e.to_string())?;
+        } else {
+            page.navigate_with_wait(url, wait_until).await.map_err(|e| e.to_string())?;
+        }
+
+        for source in &preload_scripts {
+            if let Err(e) = page.execute_preload_script(source) {
+                tracing::debug!("Preload script error: {}", e);
+            }
+        }
+
+        let reached_network_idle = page.lifecycle.is_network_idle();
+        let network_events: Vec<_> = page.network_events.drain(..).collect();
+        let page_url = page.url_string();
+        let page_id = page.id.clone();
+        (frame_id, loader_id, network_events, page_url, page_id, reached_network_idle)
+    };
+
+    let es = session_id.clone();
+    let ts = timestamp();
+
+    let mut phase1 = vec![
+        CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "init", "timestamp": ts}), session_id: es.clone() },
+        CdpEvent { method: "Runtime.executionContextsCleared".into(), params: json!({}), session_id: es.clone() },
+        CdpEvent { method: "Page.frameNavigated".into(), params: json!({"frame": {"id": frame_id, "loaderId": loader_id, "url": page_url, "domainAndRegistry": "", "securityOrigin": page_url, "mimeType": "text/html", "adFrameStatus": {"adFrameType": "none"}}, "type": "Navigation"}), session_id: es.clone() },
+        CdpEvent { method: "Runtime.executionContextCreated".into(), params: json!({"context": {"id": 2, "origin": page_url, "name": "", "uniqueId": format!("ctx-nav-{}", page_id), "auxData": {"isDefault": true, "type": "default", "frameId": frame_id}}}), session_id: es.clone() },
+    ];
+    let world_names: Vec<String> = if ctx.isolated_worlds.is_empty() {
+        vec!["__puppeteer_utility_world__24.40.0".to_string()]
+    } else {
+        ctx.isolated_worlds.clone()
+    };
+    for (idx, world_name) in world_names.iter().enumerate() {
+        let world_ctx_id = 100 + idx as u32;
+        phase1.push(CdpEvent {
+            method: "Runtime.executionContextCreated".into(),
+            params: json!({"context": {"id": world_ctx_id, "origin": page_url, "name": world_name, "uniqueId": format!("ctx-isolated-nav-{}-{}", page_id, idx), "auxData": {"isDefault": false, "type": "isolated", "frameId": frame_id}}}),
+            session_id: es.clone(),
+        });
+    }
+    phase1.push(CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "commit", "timestamp": ts}), session_id: es.clone() });
+    ctx.pending_events.extend(phase1);
+
+    if ctx.fetch_intercept.enabled {
+        for net_event in &network_events {
+            ctx.pending_events.push(CdpEvent {
+                method: "Fetch.requestPaused".into(),
+                params: json!({
+                    "requestId": net_event.request_id,
+                    "request": {
+                        "url": net_event.url,
+                        "method": net_event.method,
+                        "headers": net_event.headers,
+                    },
+                    "frameId": frame_id,
+                    "resourceType": net_event.resource_type,
+                    "networkId": net_event.request_id,
+                }),
+                session_id: es.clone(),
+            });
+        }
+    }
+
+    for net_event in &network_events {
+        ctx.pending_events.push(CdpEvent {
+            method: "Network.requestWillBeSent".into(),
+            params: json!({"requestId": net_event.request_id, "loaderId": loader_id, "documentURL": page_url, "request": {"url": net_event.url, "method": net_event.method, "headers": net_event.headers}, "timestamp": net_event.timestamp, "wallTime": net_event.timestamp, "initiator": {"type": "other"}, "type": net_event.resource_type, "frameId": frame_id}),
+            session_id: es.clone(),
+        });
+        ctx.pending_events.push(CdpEvent {
+            method: "Network.responseReceived".into(),
+            params: json!({"requestId": net_event.request_id, "loaderId": loader_id, "timestamp": net_event.timestamp, "type": net_event.resource_type, "response": {"url": net_event.url, "status": net_event.status, "statusText": "", "headers": &*net_event.response_headers, "mimeType": net_event.response_headers.get("content-type").cloned().unwrap_or_default()}, "frameId": frame_id}),
+            session_id: es.clone(),
+        });
+        ctx.pending_events.push(CdpEvent {
+            method: "Network.loadingFinished".into(),
+            params: json!({"requestId": net_event.request_id, "timestamp": net_event.timestamp, "encodedDataLength": net_event.body_size}),
+            session_id: es.clone(),
+        });
+    }
+
+    let mut phase3 = vec![
+        CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "DOMContentLoaded", "timestamp": ts}), session_id: es.clone() },
+        CdpEvent { method: "Page.domContentEventFired".into(), params: json!({"timestamp": ts}), session_id: es.clone() },
+        CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "load", "timestamp": ts}), session_id: es.clone() },
+        CdpEvent { method: "Page.loadEventFired".into(), params: json!({"timestamp": ts}), session_id: es.clone() },
+    ];
+    if reached_network_idle || matches!(wait_until, WaitUntil::Load | WaitUntil::DomContentLoaded) {
+        let idle_ts = timestamp();
+        phase3.push(CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "networkIdle", "timestamp": idle_ts}), session_id: es.clone() });
+    }
+    phase3.push(CdpEvent { method: "Page.frameStoppedLoading".into(), params: json!({"frameId": frame_id}), session_id: es });
+    ctx.pending_events.extend(phase3);
+
+    Ok(json!({
+        "frameId": frame_id,
+        "loaderId": loader_id,
+    }))
+}
+
 pub async fn handle(
     method: &str,
     params: &Value,
@@ -16,154 +164,16 @@ pub async fn handle(
         "navigate" => {
             let url = params.get("url").and_then(|v| v.as_str())
                 .ok_or("url required")?;
-
-            // Block CDP-initiated file:// navigation by default.
-            // Anyone who can reach the CDP port (default localhost,
-            // but Docker images bind 0.0.0.0) could otherwise read
-            // any file the obscura process can read. Opt in via
-            // `obscura serve --allow-file-access` when local-HTML
-            // testing is the intended workflow.
-            if url_is_file_scheme(url) && !ctx.default_context.allow_file_access {
-                return Err(
-                    "Page.navigate to file:// is disabled. Restart with `obscura serve --allow-file-access` to enable.".to_string()
-                );
-            }
-
-            let wait_until = params.get("waitUntil")
-                .and_then(|v| {
-                    if let Some(s) = v.as_str() {
-                        Some(WaitUntil::from_str(s))
-                    } else if let Some(arr) = v.as_array() {
-                        arr.iter()
-                            .filter_map(|item| item.as_str())
-                            .map(WaitUntil::from_str)
-                            .max_by_key(|w| match w {
-                                WaitUntil::DomContentLoaded => 0,
-                                WaitUntil::Load => 1,
-                                WaitUntil::NetworkIdle2 => 2,
-                                WaitUntil::NetworkIdle0 => 3,
-                            })
-                    } else {
-                        None
-                    }
-                })
-                .unwrap_or(WaitUntil::Load);
-
-            let preload_scripts: Vec<String> = ctx.preload_scripts.iter().map(|(_, s)| s.clone()).collect();
-
-            let (frame_id, loader_id, network_events, page_url, page_id, reached_network_idle) = {
-                let page = ctx.get_session_page_mut(session_id).ok_or("No page for session")?;
-                let frame_id = page.frame_id.clone();
-                let loader_id = format!("loader-{}", uuid::Uuid::new_v4());
-
-                let nav_method = params.get("__method").and_then(|v| v.as_str()).unwrap_or("GET");
-                let nav_body = params.get("__body").and_then(|v| v.as_str()).unwrap_or("");
-                if nav_method == "POST" && !nav_body.is_empty() {
-                    page.navigate_with_wait_post(url, wait_until, nav_method, nav_body).await.map_err(|e| e.to_string())?;
-                } else {
-                    page.navigate_with_wait(url, wait_until).await.map_err(|e| e.to_string())?;
-                }
-
-                for source in &preload_scripts {
-                    if let Err(e) = page.execute_preload_script(source) {
-                        tracing::debug!("Preload script error: {}", e);
-                    }
-                }
-
-                let reached_network_idle = page.lifecycle.is_network_idle();
-                let network_events: Vec<_> = page.network_events.drain(..).collect();
-                let page_url = page.url_string();
-                let page_id = page.id.clone();
-                (frame_id, loader_id, network_events, page_url, page_id, reached_network_idle)
-            };
-
-            let es = session_id.clone();
-            let ts = timestamp();
-
-            let mut phase1 = vec![
-                CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "init", "timestamp": ts}), session_id: es.clone() },
-                CdpEvent { method: "Runtime.executionContextsCleared".into(), params: json!({}), session_id: es.clone() },
-                CdpEvent { method: "Page.frameNavigated".into(), params: json!({"frame": {"id": frame_id, "loaderId": loader_id, "url": page_url, "domainAndRegistry": "", "securityOrigin": page_url, "mimeType": "text/html", "adFrameStatus": {"adFrameType": "none"}}, "type": "Navigation"}), session_id: es.clone() },
-                CdpEvent { method: "Runtime.executionContextCreated".into(), params: json!({"context": {"id": 2, "origin": page_url, "name": "", "uniqueId": format!("ctx-nav-{}", page_id), "auxData": {"isDefault": true, "type": "default", "frameId": frame_id}}}), session_id: es.clone() },
-            ];
-            // Re-emit each isolated world the client previously registered
-            // via Page.createIsolatedWorld. Without this, Playwright's
-            // utility-world handle becomes stale after navigation and
-            // every subsequent evaluate() (including page.title()) hangs.
-            // Fallback to the legacy hardcoded Puppeteer name so older
-            // Puppeteer clients that don't call createIsolatedWorld
-            // continue to work.
-            let world_names: Vec<String> = if ctx.isolated_worlds.is_empty() {
-                vec!["__puppeteer_utility_world__24.40.0".to_string()]
-            } else {
-                ctx.isolated_worlds.clone()
-            };
-            for (idx, world_name) in world_names.iter().enumerate() {
-                let world_ctx_id = 100 + idx as u32;
-                phase1.push(CdpEvent {
-                    method: "Runtime.executionContextCreated".into(),
-                    params: json!({"context": {"id": world_ctx_id, "origin": page_url, "name": world_name, "uniqueId": format!("ctx-isolated-nav-{}-{}", page_id, idx), "auxData": {"isDefault": false, "type": "isolated", "frameId": frame_id}}}),
-                    session_id: es.clone(),
-                });
-            }
-            phase1.push(CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "commit", "timestamp": ts}), session_id: es.clone() });
-            ctx.pending_events.extend(phase1);
-
-            if ctx.fetch_intercept.enabled {
-                for net_event in &network_events {
-                    ctx.pending_events.push(CdpEvent {
-                        method: "Fetch.requestPaused".into(),
-                        params: json!({
-                            "requestId": net_event.request_id,
-                            "request": {
-                                "url": net_event.url,
-                                "method": net_event.method,
-                                "headers": net_event.headers,
-                            },
-                            "frameId": frame_id,
-                            "resourceType": net_event.resource_type,
-                            "networkId": net_event.request_id,
-                        }),
-                        session_id: es.clone(),
-                    });
-                }
-            }
-
-            for net_event in &network_events {
-                ctx.pending_events.push(CdpEvent {
-                    method: "Network.requestWillBeSent".into(),
-                    params: json!({"requestId": net_event.request_id, "loaderId": loader_id, "documentURL": page_url, "request": {"url": net_event.url, "method": net_event.method, "headers": net_event.headers}, "timestamp": net_event.timestamp, "wallTime": net_event.timestamp, "initiator": {"type": "other"}, "type": net_event.resource_type, "frameId": frame_id}),
-                    session_id: es.clone(),
-                });
-                ctx.pending_events.push(CdpEvent {
-                    method: "Network.responseReceived".into(),
-                    params: json!({"requestId": net_event.request_id, "loaderId": loader_id, "timestamp": net_event.timestamp, "type": net_event.resource_type, "response": {"url": net_event.url, "status": net_event.status, "statusText": "", "headers": &*net_event.response_headers, "mimeType": net_event.response_headers.get("content-type").cloned().unwrap_or_default()}, "frameId": frame_id}),
-                    session_id: es.clone(),
-                });
-                ctx.pending_events.push(CdpEvent {
-                    method: "Network.loadingFinished".into(),
-                    params: json!({"requestId": net_event.request_id, "timestamp": net_event.timestamp, "encodedDataLength": net_event.body_size}),
-                    session_id: es.clone(),
-                });
-            }
-
-            let mut phase3 = vec![
-                CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "DOMContentLoaded", "timestamp": ts}), session_id: es.clone() },
-                CdpEvent { method: "Page.domContentEventFired".into(), params: json!({"timestamp": ts}), session_id: es.clone() },
-                CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "load", "timestamp": ts}), session_id: es.clone() },
-                CdpEvent { method: "Page.loadEventFired".into(), params: json!({"timestamp": ts}), session_id: es.clone() },
-            ];
-            if reached_network_idle || matches!(wait_until, WaitUntil::Load | WaitUntil::DomContentLoaded) {
-                let idle_ts = timestamp();
-                phase3.push(CdpEvent { method: "Page.lifecycleEvent".into(), params: json!({"frameId": frame_id, "loaderId": loader_id, "name": "networkIdle", "timestamp": idle_ts}), session_id: es.clone() });
-            }
-            phase3.push(CdpEvent { method: "Page.frameStoppedLoading".into(), params: json!({"frameId": frame_id}), session_id: es });
-            ctx.pending_events.extend(phase3);
-
-            Ok(json!({
-                "frameId": frame_id,
-                "loaderId": loader_id,
-            }))
+            do_navigate(url, params, ctx, session_id).await
+        }
+        "reload" => {
+            let current_url = ctx.get_session_page(session_id)
+                .map(|p| p.url_string())
+                .unwrap_or_else(|| "about:blank".to_string());
+            let reload_params = json!({
+                "waitUntil": params.get("waitUntil").cloned().unwrap_or(json!("load"))
+            });
+            do_navigate(&current_url, &reload_params, ctx, session_id).await
         }
         "getFrameTree" => {
             let page = ctx.get_session_page(session_id).ok_or("No page for session")?;

crates/obscura-js/js/bootstrap.js

@@ -791,7 +791,7 @@ class Document extends Node {
   get compatMode() { return "CSS1Compat"; }
   get characterSet() { return "UTF-8"; }
   get contentType() { return "text/html"; }
-  get readyState() { return "complete"; }
+  get readyState() { return globalThis.__documentReadyState__ || 'complete'; }
   get hidden() { return false; }
   get visibilityState() { return "visible"; }
   getElementById(id) { return _wrapEl(+_dom("get_element_by_id", id)); }
@@ -805,6 +805,7 @@ class Document extends Node {
   }
   getElementsByTagName(t) { return this.querySelectorAll(t); }
   getElementsByClassName(c) { return this.querySelectorAll("." + c); }
+  getElementsByName(name) { return this.querySelectorAll('[name="' + String(name).replace(/\\/g, '\\\\').replace(/"/g, '\\"') + '"]'); }
   createElement(t) {
     const el = _wrapEl(+_dom("create_element", t.toLowerCase()));
     if (el && t.toLowerCase() === 'template') {
@@ -853,7 +854,23 @@ class Document extends Node {
     return new Cls('');
   }
   createRange() { return { setStart(){}, setEnd(){}, collapse(){}, selectNodeContents(){}, cloneContents(){ return document.createDocumentFragment(); } }; }
-  addEventListener(type, fn, opts) {} removeEventListener() {} dispatchEvent() { return true; }
+  addEventListener(type, fn, opts) {
+    if (typeof fn !== 'function') return;
+    if (!this._listeners) this._listeners = {};
+    if (!this._listeners[type]) this._listeners[type] = [];
+    if (!this._listeners[type].includes(fn)) this._listeners[type].push(fn);
+  }
+  removeEventListener(type, fn) {
+    if (this._listeners?.[type]) {
+      this._listeners[type] = this._listeners[type].filter(h => h !== fn);
+    }
+  }
+  dispatchEvent(event) {
+    if (!event) return true;
+    const handlers = (this._listeners?.[event.type] || []).slice();
+    for (const h of handlers) { try { h.call(this, event); } catch(e) { console.error('document event error:', e); } }
+    return !event.defaultPrevented;
+  }
   createTreeWalker(root, whatToShow, filter) {
     whatToShow = whatToShow || 0xFFFFFFFF; // NodeFilter.SHOW_ALL
     const walker = {