diff --git a/readme.txt b/readme.txt
index 957c62f..987dc43 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Tags: asciicast, asciiplayer, asciinema, terminal, block
 Requires at least: 6.3
 Requires PHP: 7.4
 Stable tag: 1.1.0
-License: GPLv3
+License: GPL-3.0-only
 License URI: https://www.gnu.org/licenses/gpl-3.0.html
 
 Play terminal recordings with a native block, real editor playback previews, and compatible shortcodes.
diff --git a/scripts/verify-build.mjs b/scripts/verify-build.mjs
index 3e1d3f0..7fad113 100644
--- a/scripts/verify-build.mjs
+++ b/scripts/verify-build.mjs
@@ -1,5 +1,7 @@
 import { readFile } from 'node:fs/promises';
 import { createHash } from 'node:crypto';
+import { runInNewContext } from 'node:vm';
+import assert from 'node:assert/strict';
 const hash = (data) => createHash('sha256').update(data).digest('hex');
 const asset = await readFile('build/index.asset.php', 'utf8');
 if (asset.includes('react-jsx-runtime')) throw new Error('Automatic JSX runtime would break the WordPress 6.3 baseline.');
@@ -14,4 +16,38 @@ for (const [destination, original] of [
 }
 const metadata = JSON.parse(await readFile('build/block.json', 'utf8'));
 if (metadata.apiVersion !== 3 || metadata.name !== 'lamgc/asciiplayer') throw new Error('Unexpected block metadata.');
-console.log('Verified WordPress 6.3-compatible JSX dependencies, block metadata, and exact local vendor files.');
+// Execute the emitted bundle too: source-only tests miss minifier scope errors.
+// In particular, never shadow the global document used by mountPlayers' default.
+const view = await readFile('build/view.js', 'utf8');
+for (const readyState of ['loading', 'complete']) {
+  let mounts = 0;
+  let onReady;
+  const container = {
+    dataset: { apSrc: '/recording.cast', apOptions: '{"preload":false}' },
+  };
+  const document = {
+    readyState,
+    body: { classList: { contains: () => false } },
+    querySelector: () => null,
+    querySelectorAll: () => [container],
+    addEventListener(event, callback) {
+      assert.equal(event, 'DOMContentLoaded');
+      onReady = callback;
+    },
+    defaultView: { AsciinemaPlayer: { create(source, target) {
+      assert.equal(source, '/recording.cast');
+      assert.equal(target, container);
+      mounts++;
+      return { addEventListener() {} };
+    } } },
+  };
+  runInNewContext(view, { document, window: { wp: { i18n: { __: (text) => text } } }, URL });
+  if (readyState === 'loading') {
+    assert.equal(mounts, 0);
+    onReady();
+    onReady(); // A repeated boot must not mount the same container twice.
+  }
+  assert.equal(mounts, 1, `Frontend boot failed at readyState=${readyState}`);
+  assert.equal(container.dataset.apStatus, 'idle');
+}
+console.log('Verified WordPress 6.3 dependencies, block metadata, exact vendor files, and emitted frontend boot.');
diff --git a/src/view.js b/src/view.js
index d71a02a..21a987f 100644
--- a/src/view.js
+++ b/src/view.js
@@ -15,9 +15,9 @@ function showError( container ) {
 
 /** One explicit instance per front-end container; never scan an editor canvas. */
 export function mountPlayers( root = document ) {
-	const document = root.ownerDocument || root;
-	if ( document.body?.classList.contains( 'wp-admin' ) || document.querySelector( '.editor-styles-wrapper, .block-editor-block-list__layout' ) ) return;
-	const api = document.defaultView?.AsciinemaPlayer;
+	const ownerDocument = root.ownerDocument || root;
+	if ( ownerDocument.body?.classList.contains( 'wp-admin' ) || ownerDocument.querySelector( '.editor-styles-wrapper, .block-editor-block-list__layout' ) ) return;
+	const api = ownerDocument.defaultView?.AsciinemaPlayer;
 	if ( typeof api?.create !== 'function' ) return;
 	root.querySelectorAll( '.asciiplayer-container' ).forEach( ( container ) => {
 		if ( instances.has( container ) ) return;
@@ -45,10 +45,10 @@ export function mountPlayers( root = document ) {
 			// by its parsed duration rather than merely by a mounted DOM wrapper.
 			if ( options.preload || options.autoPlay || options.poster?.startsWith( 'npt:' ) ) {
 				let ticks = 0;
-				const timer = document.defaultView.setInterval( () => {
+				const timer = ownerDocument.defaultView.setInterval( () => {
 					const duration = player.getDuration();
 					if ( typeof duration === 'number' && Number.isFinite( duration ) ) container.dataset.apStatus = 'ready';
-					if ( ! container.isConnected || container.dataset.apStatus !== 'loading' || ++ticks > 200 ) document.defaultView.clearInterval( timer );
+					if ( ! container.isConnected || container.dataset.apStatus !== 'loading' || ++ticks > 200 ) ownerDocument.defaultView.clearInterval( timer );
 				}, 150 );
 			} else {
 				container.dataset.apStatus = 'idle';