Line Break - Emoji Modifier

Emoji Modifier is a specific value that controls line breaking behavior for certain emoji characters, particularly those with skin tone variations. When an emoji modifier, such as a skin tone selector, appears after a base emoji, this value ensures that the modifier stays attached to the base character, preventing a line break from occurring between them. This keeps the composite emoji visually intact, avoiding awkward splits where a modifier might appear on its own at the start or end of a line. The value effectively signals that the modifier has no independent breaking opportunity, so it must remain glued to the preceding base emoji for correct rendering and readability.