verticalSlides

Group one or more slides vertically (reveal.js "vertical stacks"). Inside the block, use markdownSlide, htmlSlide, or dslSlide to add slides; they are stacked top-to-bottom in the order declared and share a single <section> wrapper so the whole stack can share a background, CSS class, or VerticalSlidesContext.slideConfig.

Throws

if the block adds zero slides.