Method to change self-closing tags to explicit tags in Javascript?

Question

Does there exist a method or function that can convert the self-closing tags to explicit tags in Javascript? For example:

<span class="label"/>

converted to :

<span class ="label"></span>

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I would like to copy a new HTML from the iframe to the outerHTML of the main page, as the new HTML generated contains self-closing tags, the outerHTML doesn't recognize them and then doesn't change and the page doesn't show correctly. But when the format is standard, that is,with the non-self-closing tags, the outerHTML will take the new HTML,and the page shows perfectly.This is why I would like to change the tags.

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And this html is in a string

In fact, I don't want to parse HTML, I just want to find the "< span.../>"and replace it with "< span...>< /span>"

Answer 1

Thanks all, I finally use the silly method to change the self-closing tags, maybe it'll help someone like me:

var splitSpan = textHTML.split(">");
var i=0;
for(i=0;i<splitSpan.length-1;i++){
    var lengthSpan = splitSpan[i].length;
    var subSpan = splitSpan[i].substring(1,5);
    var endSpan = splitSpan[i].charAt(lengthSpan-1);
    
    if(subSpan=="span" && endSpan=="/")
    {           
        splitSpan[i]=setCharAt(splitSpan[i],lengthSpan-1,'>');
        splitSpan[i]=splitSpan[i]+"</span>";
    }
    else
    {
        splitSpan[i]=splitSpan[i]+">";
    }
}

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function setCharAt(str,index,chr) {
    if(index > str.length-1) return str;
    return str.substr(0,index) + chr + str.substr(index+1);
}