Iframe where src, what is blob??

How to hide iframe src link?

When you debug, you can see: <iframe src="blob:https://www.nodejsauto.com/blah-blah"...

Where src youtube???

Youtube here

This is code: creat elem <div id="htmlTest"></div>

//
var blobMe= URL['createObjectURL'](new Blob([''], {type: 'text/html'}));
var elIframe = document['createElement']('iframe');
elIframe['setAttribute']('frameborder', '0');
elIframe['setAttribute']('width', '100%');
elIframe['setAttribute']('height', '500px');
elIframe['setAttribute']('allowfullscreen', 'true');
elIframe['setAttribute']('webkitallowfullscreen', 'true');
elIframe['setAttribute']('mozallowfullscreen', 'true');
elIframe['setAttribute']('src', blobMe);
var idOne= 'gepa_'+ Date.now();
elIframe['setAttribute']('id', idOne);
document.getElementById('htmlTest').appendChild(elIframe);
const iframeHere= 'https://www.youtube.com/embed/GdIEi4lIH_Q';
document['getElementById'](idOne)['contentWindow']['document'].write('<script type="text/javascript">location.href = "' + iframeHere + '";</script>')
//

./.