JSFiddle - React, Tailwind, and code Playground

JavaScript

function getDocumentSize()
{
    return {
        width: (document.body.scrollWidth > document.documentElement.scrollWidth)?
           document.body.scrollWidth:
        document.documentElement.scrollWidth,
        height: (document.body.scrollHeight > document.documentElement.scrollHeight)?
        document.body.scrollHeight:
        document.documentElement.scrollHeight;
    }
}