Continuation of #17131

Front-end

CSS

JavaScript

Deprecated global variables

• $ and jQuery: either ship your own jQuery in a bundle or switch to another library

Backend

Removed from public namespace:

Deprecations

Behavorial changes

• ISimpleFolder::newFile() does not write the file anymore directly (see Create SimpleFile only when writing the content #19493). To write the file again, provide an empty string content '' in newFile() or call putContent('') on the returned object.