Get the selection-popup element in script?

[le zhang]

Hi, 

I can find the element with CSS path `html body.sidebar-open div#reader-ui div.split-view div.primary div.view-popup.selection-popup.page-popup-bottom` in Inspector, but I want to get it from the Zotero object. 

Methods I have tried but failed: 

1. click Use in Console and get a object named temp0, but I don't know what the top most html parentelement is obtained by `temp0.parentElement.parentElement.parentElement.parentElement.parentElement` 

2. I thought it would be `ZoteroPanel` or `Zotero.Reader.getByTabID(currentId)`, but they are not

Could anyone please tell me how to get the selection-popup element in script? 

Thanks!

[XY Wong]

FYR: https://github.com/windingwind/zotero-pdf-translate/blob/f2258bc0bee743f72618075271d91fe57125d8e8/src/modules/popup.ts#L81-L89