Hey 
The reason that some of them will give you a blank page in your browser is due to the fact that they hide there content until somethings ask them to show it.
In the hacking script I made, I wrote the following in the JS file :
var htmlUI = window.document.getElementById("htmlAll");
htmlUI.style.display = "none";
Which hides the tablet UI until someones bring the tablet out by pushing a certain key then I change the attribute of display to contents (other values exists)
You will have the attribute visibility or display that will be put to hidden or none most of the times. It can be in the HTML (inside the tag of the div itself), inside the CSS or inside the JS.
EDIT : there is another thing, less likely but sometimes the browser will find something he can’t understand and bring an error that will endup in a blank page. Like the following line :
<script src="nui://game/ui/jquery.js" type="text/javascript"></script>
In order to know if it’s the case just fire the dev tool of you browser (F12) et check if there is any error.
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