Confirms source code has been pasted into the editor before the pipeline runs.
Auto-detect whether the pasted text is JavaScript, CSS or HTML. You can override with the language switch — a manual pick shows as MAN, an uncertain guess shows as GUESS.
Tokenizes the source so formatting can't silently mangle it. Unbalanced strings, comments or tags report FAIL here and nothing is emitted.
Confirms formatted output is ready and reports the live before/after byte delta.