We have the following tags:
What are all these tags for?
- Is there a semantic difference between a question's having both shabbat and yom-tov and its having shabbat-yomtov?
- Should shabbat-yomtov exist at all?
- Should every question now tagged with both shabbat and yom-tov be instead tagged shabbat-yomtov?
UPDATE: I've effected the following, from the answers and comments below: the shabbas-yomtov tag is now merged into the shabbat tag, whose wiki indicates that it should be used also for questions that apply to shabas and yom tov equally. I have added the same advice to the yom-tov tag wiki also.