Buttons only: add · duplicate · spellcheck · PDF. Spellcheck marks the words the build's dictionary refused, on every slide, with a wavy underline and a red wash; every contact-sheet thumbnail wears its own count. Its red badge opens them: every flagged word on this slide with the build's suggestions — a pick rewrites the row, Ignore in this deck silences the word. A click on a marked word while you are editing its row fixes just that one. A deck served by bin/serve.mjs also checks the words you type when you leave the row; opened any other way it checks only what the build checked. The underline under the word you are typing is the browser's own. Never present, print or PDF.