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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?

bskaggs
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  • Your examples render as separate characters for me on macOS because they include ordinary space characters (U+0020). The space cannot be selected or deleted. If I enter the example manually it's rendered as a pair of empty boxes: ⃠. – Potatoswatter Jan 14 '17 at 09:43

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