Tags: Possible to create non-canonical warnings, categories, or ratings

If appropriate, enter the URL of a page where the problem can be seen:
Full and current list of non-canonical categories, ratings, or warnings:
http://archiveofourown.org/tag_sets/new

What steps will reproduce the problem?
Altering the Post New Work form's source, either manually or with a translation tool, will allow you to create tags.

One way to reproduce, using Safari for the specifics:
1. Log in

2. Post > New Work

3. In a browser with developer tools enabled, choose Show Web Inspector from Develop
menu (or your browser's equivalent) or right-click the field you want to modify and
choose Inspect Element, e.g. Rating.

4. Locate the select menu, which looks something like this:
<select id="work_rating_string" name="work[rating_string]">
<option value="Not Rated" selected="selected">Not Rated</option>
<option value="General Audiences">General Audiences</option>
<option value="Teen And Up Audiences">Teen And Up Audiences</option>
<option value="Mature">Mature</option>
<option value="Explicit">Explicit</option>
</select>

5. In the Web Inspector, right click on the part that says <select id="work_rating_string"
name="work[rating_string]"> and choose Edit as HTML.

6. Modify the select field by adding an option and removing the selected attribute
of the current rating, e.g.
<select id="work_rating_string" name="work[rating_string]">
<option value="Made Up Rating">Made Up Rating</option>
<option value="Not Rated">Not Rated</option>
<option value="General Audiences">General Audiences</option>
<option value="Teen And Up Audiences">Teen And Up Audiences</option>
<option value="Mature">Mature</option>
<option value="Explicit">Explicit</option>
</select>

7. Fill in the necessary information to create a work and post.

8. See your work has been successfully created with your made up warning, category,
or rating, like on http://test.archiveofourown.org/works/1064520, which has the non-canonical rating "PWP Smutty Smut," the non-canonical category "ALL THE CATEGORIES ALL THE PORN," and the non-canonical warning "IT HAS WAY TOO MUCH SEX RUN FOR YOUR LIFE."

A brief history of this bug may be found in and AO3-3724.

has been created for cleaning up existing non-canonical tags.

What is the expected output? What do you see instead?

It should not be possible to add warnings, categories, or ratings.

If you use a noncanonical rating, it should fail with the error about required tags being missing.

If you use a single noncanonical warning, it should fail with an error message about required warning tags being missing.

If you use a noncanonical warning and a canonical one, it should just silently fail to add the noncanonical.

If you use a noncanonical category, it should silently fail to add it.