diff --git a/extensions/amp-ife-test/0.1/amp-ife-test.js b/extensions/amp-ife-test/0.1/amp-ife-test.js
deleted file mode 100644
index eecb556efe253..0000000000000
--- a/extensions/amp-ife-test/0.1/amp-ife-test.js
+++ /dev/null
@@ -1,89 +0,0 @@
-/**
- * Copyright 2016 The AMP HTML Authors. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import {ampdocFor} from '../../../src/ampdoc';
-import {installFriendlyIframeEmbed} from '../../../src/friendly-iframe-embed';
-import {isLayoutSizeDefined} from '../../../src/layout';
-
-/** @const */
-const TAG = 'amp-ife-test';
-
-// DO NOT SUBMIT: This class is to simply demonstrate how a friendly iframe
-// is created.
-class AmpIfeTest extends AMP.BaseElement {
-
- /** @override */
- isLayoutSupported(layout) {
- return isLayoutSizeDefined(layout);
- }
-
- /** @override */
- buildCallback() {
- const template = this.element.querySelector('template') ||
- this.element.querySelector('script')
- /** @const @private {string} */
- this.htmlContent_ = template./*OK*/innerHTML;
-
- /** @const @private {!Element} */
- this.container_ = this.element.ownerDocument.createElement('div');
- this.applyFillContent(this.container_);
- this.element.appendChild(this.container_);
-
- /** @private {?HTMLIFrameElement} */
- this.iframe_ = null;
- }
-
- /** @override */
- layoutCallback() {
- const iframe = this.element.ownerDocument.createElement('iframe');
- this.iframe_ = iframe;
- this.applyFillContent(iframe);
-
- iframe.setAttribute('frameborder', '0');
- iframe.setAttribute('allowfullscreen', '');
- iframe.setAttribute('allowtransparency', '');
- iframe.setAttribute('scrolling', 'no');
-
- const embedPromise = installFriendlyIframeEmbed(iframe, this.container_, {
- url: 'https://acme.org/embed&1',
- html: this.htmlContent_,
- extensionIds: ['amp-image-lightbox'],
- fonts: ['https://fonts.googleapis.com/css?family=Roboto'],
- });
- return embedPromise.then(embed => {
- this.embed_ = embed;
-
- // Run some tests.
- const ampdocService = ampdocFor(this.win);
- const ampdoc = ampdocService.getAmpDoc(this.element);
-
- const img = iframe.contentWindow.document.querySelector('amp-img');
- const ampdoc2 = ampdocService.getAmpDoc(img);
- console./*OK*/error('AMPDOC2: ', ampdoc2, ampdoc2 == ampdoc);
-
- const layoutRect = this.getViewport().getLayoutRect(img);
- console./*OK*/error('layoutRect: ', layoutRect.top, layoutRect);
-
- setTimeout(() => {
- console./*OK*/error('REMOVE IFRAME');
- this.container_.removeChild(iframe);
- this.embed_.destroy();
- }, 5000);
- });
- }
-}
-
-AMP.registerElement(TAG, AmpIfeTest);
diff --git a/gulpfile.js b/gulpfile.js
index e816f168f060e..8621676517ea2 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -101,8 +101,6 @@ declareExtension('amp-vine', '0.1', false, 'NO_TYPE_CHECK');
declareExtension('amp-viz-vega', '0.1', true, 'NO_TYPE_CHECK');
declareExtension('amp-google-vrview-image', '0.1', false, 'NO_TYPE_CHECK');
declareExtension('amp-youtube', '0.1', false);
-// DO NOT SUBMIT: to demo API only.
-declareExtension('amp-ife-test', '0.1', false, 'NO_TYPE_CHECK');
/**
* @param {string} name
diff --git a/test/manual/amp-image-lightbox.amp.html b/test/manual/amp-image-lightbox.amp.html
index a9f05151272e7..c22a27eda3e77 100644
--- a/test/manual/amp-image-lightbox.amp.html
+++ b/test/manual/amp-image-lightbox.amp.html
@@ -7,8 +7,6 @@
-
-
-
-
-
-
-
-