在Go中获取具有静态宽度的html的高度

Question

I am using https://github.com/slotix/pageres-go-wrapper to get images of html files in my application. In order to do this, I need the height and the width of the image I want to create. I plan on using a static width so that's no problem. My issue is that I do not want to use a static height. I want to create an image that is exactly the height of the html's document.body.scrollheight so as to neither crop out the bottom of the page or to leave empty white space at the bottom of the image. My question is, is there any way to get the document.body.scrollheight value or any eqivalent value from an html document before the html document is loaded, provided I know the width the document would load with? In other words, given an html file and a static width, can the height of a that html page be derived?