Ckeditor cuts all tags?

Question

CKEditor

Guys, help.
ckeditor cuts all tags, removes span div, class, id everything that can
be added to config.js so that it is not deleted

Answer 1

CKEDITOR.editorConfig = function( config ) {
config.language = 'ru';
config.startupMode = 'source'; // mode Source
config.toolbar = 'MyToolbar'; // custom panel
config.indentClasses = ["ul-grey", "ul-red", "text-red", "ul-content-red", "circle", "style-none", "decimal", " paragraph-portfolio-top", "ul-portfolio-top", "url-portfolio-top", "text-grey"];
config.protectedSource.push(/<(style)[^>]*>.*<\/style>/ig);
config.protectedSource.push(/<(script)[^>]*>.*<\/script>/ig);// enable tags

Answer 2

Hello!
I insert video through the videodetector plugin. The video is inserted and displayed normally. I then go into and out of "Source" mode without changing anything. And after exiting the "Source" mode, no video is shown. In this case, the html-code in the "Source" mode does not change.
Here is part of my settings:
config.protectedSource.push(/<(iframe)[^>]*>.*<\/iframe>/ig);
config.protectedSource.push(/<(input)[^>]*>/ig);
config.extraAllowedContent = 'iframe[*]{*}(*);';
config.allowedContent = true;
config.allowedContentRules = true;
What else do I need to configure so that after exiting the "Source" mode, the video is shown?
After leaving the "Source" mode
The same thing happens if I add the html-code of the video not through the videodetector plugin, but in the "Source" mode.
ckeditor 4.6.2