Firebug 和 google 控制台都不允许更改通过 pdf.js 呈现的内容，为什么？ 如何？

Question

One can not change content (DOM elements) rendered through pdf.js using firebug and google. How pdf.js achieve this, how can I do the same in my html page

Answer 1

PDF.js renders its output into different <canvas> elements (one per page). You can see a small preview of the canvas when using the Firefox DevTools:

It still generates DOM elements, though, to allow interacting with the contents, ie selecting and copying them.