Grapheme Base - Yes
Yes is the designation for a code point that serves as a foundational element in text rendering, meaning it can stand at the start of a grapheme cluster or combine with following marks to form a single user-perceived character. This includes letters, digits, punctuation, and symbols that are not combining marks, spacing enclosures, or control characters. When a character has this value, it acts as the primary base for visual display, allowing subsequent combining characters to attach to it, thereby enabling proper text segmentation and line breaking in complex scripts. It excludes zero-width joiners, variation selectors, and other non-spacing modifiers, ensuring that only characters with inherent glyph shape or width qualify. This value is essential for algorithms that determine where a grapheme begins, supporting accurate cursor movement, selection, and wrapping in multilingual text.