Cool, you found the answer I was going to give you 
Apologies got not being faster to respond, but I was on vacation for 2 weeks. Back now!
Hi @chrismills ,
Below is the body of the html page for the assessment: https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Mozilla_splash_page
I would appreciate if you can go through the file and let me know if it is correct.
<body>
<header>
<h1>Mozilla</h1>
<!-- insert <img> element, link to the small
version of the Firefox logo -->
<img src="firefox_logo-only_RGB_400.png" alt="Firefox Logo">
</header>
<main>
<article>
<!-- insert iframe from youtube -->
<iframe width="560" height="315" src="https://www.youtube.com/embed/p85rO57cWKM" frameborder="0" allowfullscreen></iframe>
<h2>Rocking the free web</h2>
<p>Mozilla are a global community of technologists, thinkers, and builders, working together to keep the Internet alive and accessible, so people worldwide can be informed contributors and creators of the Web. We believe this act of human collaboration across an open platform is essential to individual growth and our collective future.</p>
<p>Click on the images below to find more information about the cool stuff Mozilla does. <a href="https://www.flickr.com/photos/mathiasappel/21675551065/">Red panda picture</a> by Mathias Appel.</p>
</article>
<div class="further-info">
<!-- insert images with srcsets and sizes -->
<a href="https://www.mozilla.org/en-US/firefox/new/">
<img srcset="firefox_logo-only_RGB_Original.png 1200w,
firefox_logo-only_RGB_400.png 400w,
firefox_logo-only_RGB_120.png 120w"
sizes="(max-width: 480px) 120px,
400px"
src="firefox_logo-only_RGB_Original.png"
alt="Firefox Logo"
>
</a>
<a href="https://www.mozilla.org/">
<img
srcset="mozilla-dinosaur-head_Original.png 1200w,
mozilla-dinosaur-head_400.png 400w,
mozilla-dinosaur-head_120.png 120w"
sizes="(max-width: 480px) 120px,
400px"
src="mozilla-dinosaur-head_Original.png"
alt="Mozilla Logo"
>
</a>
<a href="https://addons.mozilla.org/">
<img
srcset="firefox-addons_120.png 120w,
firefox-addons_400.png 400w"
sizes="(max-width: 480px) 120px,
400px"
src="firefox-addons_400.png"
alt="Mozilla Add-Ons"
>
</a>
<a href="https://developer.mozilla.org/en-US/">
<img src="developer_mozilla_dinosar_head.svg" alt="Mozilla Developer Network Logo" >
</a>
<div class="clearfix"></div>
</div>
<div class="red-panda">
<!-- insert picture element -->
<picture>
<source media="(max-width: 600px)" srcset="red-panda-closeup.png">
<source media="(min-width: 601px)" srcset="red-panda-1200.jpeg">
<img src="red-panda-Original.jpg" alt="The beautiful red panda">
</picture>
</div>
</main>
HI, I’ve just finished the assement “Mozilla Spash Page” so I would like to somwone nice can give me the marking guide 
PS: Sorry for my bad english
Hello!
No problem at all. The marking guide is here:
And the finished example code can be found here:
Let me know if you need any more help.
Thanks!
Hello. Just finished “Mozilla splash page” assessment. Here is the link: https://cipdanila.github.io/splash-page/. Any suggestion, especially regarding the mobile version of my site? Thank you!
This looks pretty good to me, having compared it to our finished version: https://mdn.github.io/learning-area/html/multimedia-and-embedding/mdn-splash-page-finished/
If you want to check it out further, I’d recommend comparing your source code to our source code: https://github.com/mdn/learning-area/blob/master/html/multimedia-and-embedding/mdn-splash-page-finished/index.html
You can also find the marking guide here: https://github.com/mdn/learning-area/blob/master/html/multimedia-and-embedding/mdn-splash-page-finished/marking-guide.md
Let me know if you have any specific questions about it.
Best regards.