chore: move EmbedGH live sample into the page (mdn#40409)

* chore: move EmbedGH live sample into the page

* Fix up arbitrary line breaks

---------

Co-authored-by: Hamish Willee <hamishwillee@gmail.com>

Author: bsmth

files/en-us/web/api/mediaerror/message/index.md

@@ -8,83 +8,83 @@ browser-compat: api.MediaError.message
 
 {{APIRef("HTML DOM")}}
 
-The read-only property **`MediaError.message`** returns a
-human-readable string offering specific
-diagnostic details related to the error described by the `MediaError` object,
-or an empty string (`""`) if no diagnostic information can be determined or
-provided.
+The read-only property **`MediaError.message`** returns a human-readable string offering specific diagnostic details related to the error described by the `MediaError` object, or an empty string (`""`) if no diagnostic information can be determined or provided.
 
 ## Value
 
-A string providing a detailed, specific explanation of what went
-wrong and possibly how it might be fixed. This is _not_ a generic description of
-the {{domxref("MediaError.code")}} property's value, but instead goes deeper into the
-specifics of this particular error and its circumstances. If no specific details are
-available, this string is empty.
+A string providing a detailed, specific explanation of what went wrong and possibly how it might be fixed. This is _not_ a generic description of the {{domxref("MediaError.code")}} property's value, but instead goes deeper into the specifics of this particular error and its circumstances.
+If no specific details are available, this string is empty.
 
 ## Examples
 
-This example creates an {{HTMLElement("audio")}} element, establishes an error handler
-for it, then lets the user click buttons to choose whether to assign a valid audio file
-or a missing file to the element's [`src`](/en-US/docs/Web/HTML/Reference/Elements/audio#src) attribute. The error
-handler outputs a message to a box onscreen describing the error, including both the
-`code` and the `message`.
+This example creates an {{HTMLElement("audio")}} element, establishes an error handler for it, then lets the user click buttons to choose whether to assign a valid audio file or a missing file to the element's [`src`](/en-US/docs/Web/HTML/Reference/Elements/audio#src) attribute.
+The error handler outputs a message to a box onscreen describing the error, including both the `code` and the `message`.
 
-Only the relevant parts of the code are displayed; you can [see the complete source code here](https://github.com/mdn/dom-examples/tree/main/media/mediaerror).
+```html
+<audio controls id="audio"></audio>
+<div>
+  <button id="valid-button">Valid File</button>
+  <button id="invalid-button">Missing File</button>
+</div>
+<pre id="log"></pre>
+```
 
-The example creates an {{HTMLElement("audio")}} element and lets the user assign either
-a valid music file to it, or a link to a file which doesn't exist. This lets us see the
-behavior of the {{domxref("HTMLMediaElement/error_event", "error")}} event handler, which is received by an event handler
-we add to the `<audio>` element itself.
+The example creates an {{HTMLElement("audio")}} element and lets the user assign either a valid music file to it, or a link to a file which doesn't exist.
+This lets us see the behavior of the {{domxref("HTMLMediaElement/error_event", "error")}} event handler, which is received by an event handler we add to the `<audio>` element itself.
 
 The error handler looks like this:
 
 ```js
+const audioElement = document.getElementById("audio");
+const validButton = document.getElementById("valid-button");
+const invalidButton = document.getElementById("invalid-button");
+
+const logMessage = (msg) => {
+  const now = new Date();
+  const timestamp = now.toLocaleTimeString();
+  document.getElementById("log").innerText += `[${timestamp}] ${msg}\n`;
+};
+
+validButton.addEventListener("click", () => {
+  audioElement.src = "https://mdn.github.io/shared-assets/audio/guitar.mp3";
+});
+
+invalidButton.addEventListener("click", () => {
+  audioElement.src = "no-file-here.mp3";
+});
+
 audioElement.onerror = () => {
-  let s = "";
-  const err = audioElement.error;
+  let message = "";
+  let err = audioElement.error;
 
   switch (err.code) {
     case MediaError.MEDIA_ERR_ABORTED:
-      s += "The user canceled the audio.";
+      message += "The user canceled the audio.";
       break;
     case MediaError.MEDIA_ERR_NETWORK:
-      s += "A network error occurred while fetching the audio.";
+      message += "A network error occurred while fetching the audio.";
       break;
     case MediaError.MEDIA_ERR_DECODE:
-      s += "An error occurred while decoding the audio.";
+      message += "An error occurred while decoding the audio.";
       break;
     case MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED:
-      s +=
+      message +=
         "The audio is missing or is in a format not supported by your browser.";
       break;
     default:
-      s += "An unknown error occurred.";
+      message += "An unknown error occurred.";
       break;
   }
 
-  const message = err.message;
-
-  if (message?.length > 0) {
-    s += ` ${message}`;
-  }
-
-  displayErrorMessage(`<strong>Error ${err.code}:</strong> ${s}<br>`);
+  logMessage(`Error ${err.code}: ${message}`);
 };
 ```
 
-This gets the {{domxref("MediaError")}} object describing the error from the
-{{domxref("HTMLMediaElement.error", "error")}} property on the
-{{domxref("HTMLAudioElement")}} representing the audio player. The error's
-{{domxref("MediaError.code", "code")}} attribute is checked to determine a generic error
-message to display, and, if `message` is not empty, it's appended to provide
-additional details. Then the resulting text is output to the log.
-
-### Result
-
-You can try out this example below, and can [see the example in action outside this page here](https://mdn.github.io/dom-examples/media/mediaerror/).
+This gets the {{domxref("MediaError")}} object describing the error from the {{domxref("HTMLMediaElement.error", "error")}} property on the {{domxref("HTMLAudioElement")}} representing the audio player.
+The error's {{domxref("MediaError.code", "code")}} attribute is checked to determine a generic error message to display, and, if `message` is not empty, it's appended to provide additional details.
+Then the resulting text is output to the log.
 
-{{ EmbedGHLiveSample('dom-examples/media/mediaerror', 650, 200) }}
+{{embedlivesample("", , '300')}}
 
 ## Specifications