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Possible to create a tag with no name using Hangul filler characters

Description

It’s possible to create a tag using spaces, e.g. the fandom tag https://test.archiveofourown.org/tags/%E3%85%A4 on this work, which consists solely of the Hangul filler Unicode character. You can try copying the character here: . (There is also a halfwidth Hangul filler character you can do this with. I am not sure if the bug is the same with the Hangul Choseong filler and/or the Hangul Jungseong filler.)

Notes

For future reference, a way to figure out what a character is based on the encoded URL:

Update

Upon further investigation, this appears to be a font issue. The character displays as a blank space in some fonts, e.g. the one used in the work meta (the dots are just the bottom border styling on tag links), but as a visible character in others, e.g. the one on the blurb:

Both screenshots are from macOS; on iOS, which has different fonts, both instances of the tag appear as spaces.

Environment

None

Status

Assignee

Unassigned

Reporter

Sarken

Roadmap

Tags
Tag Wrangling

Priority

High

Affects versions

0.9.250

Fix versions

None

Components

BackEnd

Difficulty

Medium

Required Access Level

None

Milestone

Internal 0.9