v0.21.0

Semantic Slides

Slides now use semantic Markdown instead of treating every heading as a named section. Use a single H1 for the slide title, write the body directly after it, and replace structural sections such as # Title, # Body, # Subtitle, and # Heading with ordinary title and body content. For example, replace # Title followed by the title text with # The actual title, and move any display title from front matter into the H1.

Template-specific placeholders are exact, case-sensitive H2 headings: ## Translation, ## Caption, ## Left, and ## Right. Custom templates should replace self.section(name) with self.extract(name) before rendering self.document; extraction removes that placeholder so it can be positioned independently.

Slide Scripts

Slide scripts are now exposed only through Slide#scripts. Replace the compatibility Slide#script accessor and script: initializer argument with the ordered scripts array.