javascript - JS overlay without direct access to html -


i attempting add javascript overlay onload, without direct access html. i'm able upload .js , .css files.

how go doing this, i've searched over, no expert @ i'm seeking simple solution allow me maybe call html , insert overlay, using javascript only.

i unsure of coding of .js file contain of overlay code , html code combined.

i've been looking @ document.getelementbyid , document.write this, correct in trying way?

any suggestions?

there no way can add overlay existing html file without importing new js , css files in html file. how ever, if there other js files used or imported html file, edit , add code in js file. it'll run since js file imported in html.


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