> Also, can I use 'getElementsByClassName' on a loaded DOM.

Yes.  For example:

var html = '<span class="someClass">hi</span>';
var temp = document.createElement("div");
temp.innerHTML = html;

var span = temp.getElementsByClassName("someClass")[0];

If an element with the class "someClass" does not exist in temp, span
will be undefined.  Verify that you're inserting valid HTML and that
the element you're looking for actually exists.  Try
alert(temp.innerHTML) after you insert the content.

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