My Story Map Tour is failing to save due to an invalid html tag in a name or description. Would someone please help me determine what might be invalid in my html code?

[LianeRyan]

My Story Map Tour failed to save due to an invalid html tag in a name or description. I am using html that was previously successfully saved with only one small change. I am now inserting target="_blank" instead of target="_parent".  Is there something else wrong with the code below?

html code:

<audio controls=""><source src="http://www.science.smith.edu/gis/images/significant_trees/ENV150_Uploads/MP3/tree116.mp3" type="audio/mpeg"> </audio> <p><a href="http://www.science.smith.edu/gis/images/significant_trees/ENV150_Uploads/MP3_Transcripts/Magnolia%20stellata%20%e2%80%98Rosea%e2%80%99%20-%20Boatwright-ed-mz%20(1).htm" target="_blank">Audio Transcript</a></p> <p>Script and audio by Annabella Boatwright '18</p>

[KevinCleary]

Hello, I face the same issue with the following code:

<video width="320" height="240" controls>
<source src="https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4" type="video/mp4">
</video>

Could you please help with that? Thanks