Live Demo

Change the engine, language, theme pair, scheme, line numbers, wrapping, and deferral. The copy action always copies the complete source without gutter numbers.

What to look for

• Changing Theme pair or Color scheme updates appearance in one paint and does not invoke the engine.
• Changing Engine loads only that adapter. The core entry has no engine in its static graph.
• Defer waits for the block to approach the viewport; the visible demo starts once.
• Wrap toggles the .vsh-wrap class; it is incompatible with virtualization.
• Copy source uses copy()/getCopyPayload(), not the rendered DOM window.