How to change webBrowser DocumentText?

问题

I know that there is lot of reports that DocumentText isn't changing but Document.Body.innerHtml is. I'm interested only in simply solution how to change it other way than ordinary string (replacing substrings). Is there a possibility to use getElementById().innerText ? I want to open html file, make changes in and save it.

来源：https://stackoverflow.com/questions/20454596/how-to-change-webbrowser-documenttext