Overview
Yesterday I posted the following question Please make [storage] and [image-storage] synonyms of [online-storage]. At this time, it received two comments mentioning that online-storage is a meta-tag, so I'm wondering if there any tag in Web Applications that is not about a specific web app or web app feature, besides bookmarklets and browsers features which are directly related to web application like Greasemonkey scripts that is not a meta-tag.
At this time it looks to me that most tags in Web Applications site should use the name of a web application or a prefix to related it to a web application to make it be able to be used alone and make it means the same for different people as it's required by the tags help article but could be exceptions like things that are commonly used by different web apps.
Which are those tags, and why aren't meta-tags in the context of Web Applications SE?
Proposal: Add one answer for each of these tags and explain why it's not a meta-tag.
Related meta-questions
Examples of tags that are specific to web applications
facebook gmail google-sheets google-drive trello twitter youtube
Examples of tags that are specific to a web application feature
Gmail
gmail-filters gmail-labels gmail-search
facebook-groups facebook-pages facebook-timeline
Examples of tags that are not specific to web application
api
album
audio
collaboration
database
dns
domain
email
export
formulas
hosting
https
import
ip-address
links
offline
sharing
search
sorting
ssl
statistics
url
url-shortening
video
website
Examples of tags that could be ok as suggested by ale on their answer
Examples of tags related to bookmarklets or browsers features that could be directly related to web applications
bookmarklet
bookmarklet-rec
userscripts