UTF16 Surrogate Slice Tests Visual Study

Create a reference-led editorial image for coding using [string slicing interface], [Unicode fixtures] and [indexing contract]. Visual task: one supplementary character occupies two code-unit boxes while a boundary marker shows a potentially invalid split. Purpose: support this problem: design tests for slicing at UTF-16 surrogate boundaries; distinguish code units, code points and grapheme clusters and state whether broken surrogate output is rejected or preserved by contract. Use a 4:5 composition with a clear focal hierarchy and no decorative data. Depict one decisive moment, not a crowded infographic. Reserve blank space for any factual labels; provide their exact copy separately.

Use the attached references only for the specified visual attributes. If a required reference is missing, request it before generation. Produce one finished image with a deliberate focal point, consistent geometry and clean margins. Keep any exact wording on a separate editable label layer or leave its area blank. Do not invent evidence or present an illustration as documentary proof.