Input text is cleaned up by the htmLawed module in any editor. This cleaning process is essential for sites where unspecified number of users write articles. However, this process is not necessary for trusted users such as super administrator. If you follow this theory, you will need to do two hacks.
First is to start Basic editor instead of WYSIWYG editor in the case of administrators.
Second is to disable the qa_sanitize_html () function in the case of administrators.
Reference: https://www.question2answer.org/qa/38943/