diff --git a/editor/assets/stylesheets/main.scss b/editor/assets/stylesheets/main.scss
index 7e0b4e8af3957f..0f86e94064f95d 100644
--- a/editor/assets/stylesheets/main.scss
+++ b/editor/assets/stylesheets/main.scss
@@ -50,6 +50,10 @@ body.toplevel_page_gutenberg {
 		max-width: 100%;
 	}
 
+	iframe {
+		width: 100%;
+	}
+
 	@include break-small() {
 		padding-top: $header-height;
 	}
diff --git a/post-content.js b/post-content.js
index 185280888e2c57..a627fe0a7ef66e 100644
--- a/post-content.js
+++ b/post-content.js
@@ -40,10 +40,6 @@ window._wpGutenbergPost = {
 			'<p>Try selecting and removing or editing the caption, now you don\'t have to be careful about selecting the image or other text by mistake and ruining the presentation.</p>',
 			'<!-- /wp:core/text -->',
 
-			'<!-- wp:core/embed url="https://www.youtube.com/watch?v=Nl6U7UotA-M" -->',
-			'<figure>https://www.youtube.com/watch?v=Nl6U7UotA-M<figcaption>State of the Word 2016</figcaption></figure>',
-			'<!-- /wp:core/embed -->',
-
 			'<!-- wp:core/heading -->',
 			'<h2>The <em>Inserter</em> Tool</h2>',
 			'<!-- /wp:core/heading -->',
@@ -113,6 +109,12 @@ window._wpGutenbergPost = {
 			'<p>Prima ridens denique his te, ferri illum volumus an his. Eu vel dicat homero qualisqu, vitae regione deserunt vis ei. Graeci incorrupte liberavisse no mea, saepe voluptaria usu ex, vis dicant euismod id. At dolor reprimique eos, quo altera detraxit moderatius id. Quo iudico utinam eu, ad alia munere mel.</p>',
 			'<!-- /wp:core/text -->',
 
+			'<!-- wp:core/code -->',
+			'<pre><code>export default function MyButton() {\n\
+	return &lt;Button&gt;Click Me!&lt;/Button&gt;;\n\
+}</code></pre>',
+			'<!-- /wp:core/code -->',
+
 			'<!-- wp:core/image -->',
 			'<figure><img src="https://cldup.com/GCwahb3aOb.jpg" /></figure>',
 			'<!-- /wp:core/image -->',
@@ -149,11 +151,21 @@ window._wpGutenbergPost = {
 			'<table class="widefat"><thead><tr><th>Version</th><th>Musician</th><th>Date</th></tr></thead><tbody><tr><th><a href="https://wordpress.org/news/2015/12/clifford/">4.4</a></th><td>Clifford Brown</td><td>December 8, 2015</td></tr><tr class="alt"><th><a href="https://wordpress.org/news/2016/04/coleman/">4.5</a></th><td>Coleman Hawkins</td><td>April 12, 2016</td></tr><tr><th><a href="https://wordpress.org/news/2016/08/pepper/">4.6</a></th><td>Pepper Adams</td><td>August 16, 2016</td></tr><tr class="alt"><th><a href="https://wordpress.org/news/2016/12/vaughan/">4.7</a></th><td>Sarah Vaughan</td><td>December 6, 2016</td></tr></tbody></table>',
 			'<!-- /wp:core/table -->',
 
-			'<!-- wp:core/code -->',
-			'<pre><code>export default function MyButton() {\n\
-	return &lt;Button&gt;Click Me!&lt;/Button&gt;;\n\
-}</code></pre>',
-			'<!-- /wp:core/code -->',
+			'<!-- wp:core/heading -->',
+			'<h2>All that you can embed!</h2>',
+			'<!-- /wp:core/heading -->',
+
+			'<!-- wp:core/embed url="https://www.youtube.com/watch?v=Nl6U7UotA-M" -->',
+			'<figure>https://www.youtube.com/watch?v=Nl6U7UotA-M<figcaption>State of the Word 2016</figcaption></figure>',
+			'<!-- /wp:core/embed -->',
+
+			'<!-- wp:core/embed url="https://twitter.com/photomatt/status/868657763970404352" -->',
+			'https://twitter.com/photomatt/status/868657763970404352',
+			'<!-- /wp:core/embed -->',
+
+			'<!-- wp:core/embed url="https://make.wordpress.org/core/2017/01/17/editor-technical-overview/" -->',
+			'https://make.wordpress.org/core/2017/01/17/editor-technical-overview/',
+			'<!-- /wp:core/embed -->',
 
 		].join( '' ),
 	},