I'm trying to determine what platforms support adding the Unicode character COMBINING ENCLOSING CIRCLE BACKSLASH ( ⃠) around pre-existing emoji. The only documentation I can find about using this composing character with emoji is from Unicode Tech Report #51:
Combining marks may be applied to emoji, just like they can be applied to other characters. When that is done, the combination should take on an emoji presentation. For example, a 1⃣ is represented as the sequence "1" plus an emoji variation selector plus U+20E3 COMBINING ENCLOSING KEYCAP. Systems are unlikely, however, to support arbitrary combining marks with arbitrary emoji. Aside from U+20E3, the most likely to be supported is:
- U+20E0 COMBINING ENCLOSING CIRCLE BACKSLASH, as an overlaid ⃠, to indicate a prohibition or “NO”
For example:
- ⃠ no microphones
- ⃠ no flashes
- ⃠ no guns No combining marks other than U+20E0 and U+20E3, however, are recommended for usage.
Note: Your platform/browser combination, like mine, might render each of those as examples as two distinct characters. What platforms support them as rendering as one character?