diff --git a/src/book/init.rs b/src/book/init.rs
index 264c113d..a54c08eb 100644
--- a/src/book/init.rs
+++ b/src/book/init.rs
@@ -156,7 +156,13 @@ impl BookBuilder {
 
         let mut highlight_js = File::create(themedir.join("highlight.js"))?;
         highlight_js.write_all(theme::HIGHLIGHT_JS)?;
+        
+        let mut iframe = File::create(themedir.join("iframe.html"))?;
+        iframe.write_all(theme::IFRAME)?;
 
+        let mut wasm_entry_js = File::create(themedir.join("wasm-entry.mjs"))?;
+        wasm_entry_js.write_all(theme::WASM_ENTRY_MJS)?;
+        
         Ok(())
     }
 
diff --git a/src/renderer/html_handlebars/hbs_renderer.rs b/src/renderer/html_handlebars/hbs_renderer.rs
index f417a014..399bad0d 100644
--- a/src/renderer/html_handlebars/hbs_renderer.rs
+++ b/src/renderer/html_handlebars/hbs_renderer.rs
@@ -197,6 +197,8 @@ impl HtmlHandlebars {
             write_file(destination, "CNAME", format!("{}\n", cname).as_bytes())?;
         }
 
+        write_file(destination, "iframe.html", &theme.iframe_html)?;
+        write_file(destination, "wasm-entry.mjs", &theme.wasm_entry_mjs)?;
         write_file(destination, "book.js", &theme.js)?;
         write_file(destination, "css/general.css", &theme.general_css)?;
         write_file(destination, "css/chrome.css", &theme.chrome_css)?;
diff --git a/src/theme/mod.rs b/src/theme/mod.rs
index a1ee18af..ef29cc48 100644
--- a/src/theme/mod.rs
+++ b/src/theme/mod.rs
@@ -13,6 +13,8 @@ use std::path::Path;
 
 use crate::errors::*;
 
+pub static IFRAME: &[u8] = include_bytes!("iframe.html");
+pub static WASM_ENTRY_MJS: &[u8] = include_bytes!("wasm-entry.mjs");
 pub static INDEX: &[u8] = include_bytes!("index.hbs");
 pub static HEAD: &[u8] = include_bytes!("head.hbs");
 pub static REDIRECT: &[u8] = include_bytes!("redirect.hbs");
@@ -62,6 +64,8 @@ pub struct Theme {
     pub ayu_highlight_css: Vec<u8>,
     pub highlight_js: Vec<u8>,
     pub clipboard_js: Vec<u8>,
+    pub iframe_html: Vec<u8>,
+    pub wasm_entry_mjs: Vec<u8>,
 }
 
 impl Theme {
@@ -79,6 +83,8 @@ impl Theme {
         // Check for individual files, if they exist copy them across
         {
             let files = vec![
+                (theme_dir.join("iframe.html"), &mut theme.iframe_html),
+                (theme_dir.join("wasm-entry.mjs"), &mut theme.wasm_entry_mjs),
                 (theme_dir.join("index.hbs"), &mut theme.index),
                 (theme_dir.join("head.hbs"), &mut theme.head),
                 (theme_dir.join("redirect.hbs"), &mut theme.redirect),
@@ -161,6 +167,8 @@ impl Default for Theme {
             ayu_highlight_css: AYU_HIGHLIGHT_CSS.to_owned(),
             highlight_js: HIGHLIGHT_JS.to_owned(),
             clipboard_js: CLIPBOARD_JS.to_owned(),
+            iframe_html: IFRAME.to_owned(),
+            wasm_entry_mjs: WASM_ENTRY_MJS.to_owned(),
         }
     }
 }
@@ -248,6 +256,8 @@ mod tests {
             ayu_highlight_css: Vec::new(),
             highlight_js: Vec::new(),
             clipboard_js: Vec::new(),
+            iframe_html: Vec::new(),
+            wasm_entry_mjs: Vec::new(),
         };
 
         assert_eq!(got, empty);