I think it would be a big UX improvement on tags fields to use something like this (styled a little better) instead of plain text comma-separated entry:

http://stackoverflow.com/questions/14083272/how-to-make-a-tags-box-using...
GitHub Issue #:
2121
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Hi. I use the "[node:title] | [site:name]" tokens for the main image of news articles, blog posts, and similar publications. It's a quick and practical automatic ALT.
How to Improve SEO Performance in Backdrop CMS
I understand how tokens work, but not so much their practical use in image alt/text (maybe caption?) text. Could you give an example or two?
How to Improve SEO Performance in Backdrop CMS
https://backdropcms.org/project/metatag https://backdropcms.org/project/xmlsitemap https://backdropcms.org/project/imagefield_tokens These are more powerful modules, in my opinion...
How to Improve SEO Performance in Backdrop CMS