Run the named fixture in the local counter, then compare each result with the exact rule rather than an assumed universal character definition.
Combining acute: e + U+0301
Paste e followed by COMBINING ACUTE ACCENT. WordCount reports one grapheme, two code points, two UTF-16 units and three UTF-8 bytes. NFC normalization could create a different code-point sequence, so the analyzer measures the supplied text without rewriting it.
Family emoji with joiners
The family sequence contains four emoji people and three zero-width joiners. It is one grapheme, seven code points, eleven UTF-16 units and twenty-five UTF-8 bytes. A visual counter and a storage counter therefore answer different valid questions.
Copy counts, not private text
The summary action copies numeric counts only. It deliberately excludes the submitted text and the frequency list. This lets a user share measurement evidence without automatically placing private prose or derived terms on the clipboard.