Converting HTML element to string in JavaScript / JQuery

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I would like to convert a html element created from a string back to the string after some modifications. But I get an empty string instead.
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                <span>2021-02-05 06:11</span>
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<p>What you want is the outer HTML, not the inner HTML :</p>

<pre><code>$('&lt;some element/&gt;')[0].outerHTML;
</code></pre>
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                <span>2021-02-05 06:14</span>
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<p><code>(document.body.outerHTML).constructor</code> will return <code>String</code>. (take off <code>.constructor</code> and that's your string)</p>

<p>That aughta do it :)</p>
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                <span>2021-02-05 06:15</span>
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<p>you can just wrap it into another element and call <code>html</code> after that:</p>

<pre><code>$('&lt;div&gt;&lt;iframe width="854" height="480" src="http://www.youtube.com/embed/gYKqrjq5IjU?feature=oembed" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;&lt;/div&gt;').html();
</code></pre>

<p>note that <code>outerHTML</code> doesn't exist on older browsers but <code>innerHTML</code> still does (it doesn't exist for example in ff &lt; 11 while it's still used on many older computers)</p>
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                <span>2021-02-05 06:17</span>
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<p>You can do this:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
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<pre class="snippet-code-js lang-js prettyprint-override"><code>var $html = $('&lt;iframe width="854" height="480" src="http://www.youtube.com/embed/gYKqrjq5IjU?feature=oembed" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;');    
var str = $html.prop('outerHTML');
console.log(str);</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"&gt;&lt;/script&gt;</code></pre>
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</p>

<p>FIDDLE DEMO</p>
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                <span>2021-02-05 06:21</span>
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<p>Try a slight different approach:</p>

<pre><code>//set string and append it as object
var myHtmlString = '&lt;iframe id="myFrame" width="854" height="480" src="http://www.youtube.com/embed/gYKqrjq5IjU?feature=oembed" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;';
$('body').append(myHtmlString);

//as you noticed you can't just get it back
var myHtmlStringBack = $('#myFrame').html(); 
alert(myHtmlStringBack); // will be empty (a bug in jquery?) but...

//since an id was added to your iframe so you can retrieve its attributes back...
var width = $('#myFrame').attr('width');
var height = $('#myFrame').attr('height');
var src = $('#myFrame').attr('src');
var myReconstructedString = '&lt;iframe id="myFrame" width="'+ width +'" height="'+ height +'" src="'+ src+'" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;';
alert(myReconstructedString);
</code></pre>
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