MathJax programming puzzles have solutions that are automatically rendered anew each time they are browsed. (MathJax is Puzzling's on-site facility for displaying mathematics and is capable of much more.)

These are coding challenges whose solutions are expected to be tested directly by what gets displayed each time an answer is browsed. MathJax is well suited to programming puzzles at this site because its code is just text within an answer, its display is versatile, and it runs automatically without relying on external software or additional actions by a visitor.

Ways to learn about MathJax include visiting the source, reading the reference at Mathematics SE, and inspecting puzzles that have this tag.