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Inspect the longest line at its actual display size and check the weakest background contrast, including moving highlights or images. Leave room around the edges where a player or screen might crop the video. If active words change color, consider an additional shape or weight cue so color is not the only distinction. Avoid distracting flashing; check both a paused frame and continuous playback.
A practical checklist for preparing a shared sing-along screen, using an illustrative rehearsal rather than claims of completed tests. I am associated with Karaoke Maker, and AI assisted these notes. Use authorized music and lyrics; manual editing has a free path, while automatic processing uses credits. Check current terms.