Add HTMLelement from entry Point class

I have a `<div>` in my HTML page. What I need to do is, add `<ul>`
element inside it from my Entry point class. I have tried from
onModuleLoad function using below code,

UListElement ul=Document.get().createULElement();
ImageElement img=Document.get().createImageElement();
img.setSrc("\\images\\personas");
LIElement li=Document.get().createLIElement();
li.appendChild(img);
ul.appendChild(li);
Document.get().getElementById("divPhotos").appendChild(ul);
but my `<div>` is empty/has no childs when i run it.
what am I missing here?

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