Create, review, or edit SuperDeck presentations and presentation apps. Use when working with `slides.md`, SuperDeck Markdown syntax, fullscreen slides, `@section`/`@block`/`@widget` layout, built-in widgets such as `@image`, `@dartpad`, `@webview`, and `@qrcode`, custom Flutter widgets, `DeckOptions`, `BlockVariant`, slide parts, templates, styles, images/assets, CLI builds, plugins, or validation of SuperDeck deck behavior.
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SKILL.md
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name
superdeck-presentations
description
Create, review, or edit SuperDeck presentations and presentation apps. Use when working with `slides.md`, SuperDeck Markdown syntax, fullscreen slides, `@section`/`@block`/`@widget` layout, built-in widgets such as `@image`, `@dartpad`, `@webview`, and `@qrcode`, custom Flutter widgets, `DeckOptions`, `BlockVariant`, slide parts, templates, styles, images/assets, CLI builds, plugins, or validation of SuperDeck deck behavior.
SuperDeck Presentations
Overview
Use this skill to build accurate SuperDeck presentations: Markdown slide content, Flutter runtime wiring, assets, custom widgets, styling, templates, and verification.
Reference Routing
Load only the reference needed for the task:
Read references/authoring.md when creating or reviewing slides.md, block syntax, layouts, slide notes, built-in widgets, Markdown images, alerts, code, or hero markers.
Read references/runtime-customization.md when wiring a Flutter app, registering custom widgets, configuring DeckOptions, slide parts, styles, templates, assets, or plugins.
Read references/verification.md before claiming a deck/app works, when choosing commands, or when diagnosing build/render issues.
Workflow
Inspect the existing slides.md, lib/main.dart, pubspec.yaml, and any registered widgets/parts/templates before editing.
Decide whether the task is authoring-only, runtime customization, plugin/build setup, or verification/debugging; load the matching reference.
Prefer the repository's documented syntax and implementation behavior over generic presentation assumptions.
Keep slides readable in Markdown: use frontmatter for metadata, @section for vertical rows, child blocks/widgets for horizontal columns, and flex ratios for sizing.
Verify with a real SuperDeck build or targeted tests before reporting success.
Ground Truths
SuperDeck renders a 1280x720 logical slide into a 16:9 scaled viewport.
A slide contains vertical sections. Each @section starts a new vertical row; blocks inside that section are laid out horizontally.
@block renders Markdown. @widget and any unrecognized @name render a WidgetBlock.
Images have two authoring paths. Prefer standalone Markdown  when the image belongs in the Markdown content flow; use @image { src: ... } when the image needs block-level layout control such as fit, fixed size, flex, align, scrollable, or data: source support.
Markdown class markers such as {.heading} or {.title} drive Hero transitions for supported Markdown elements; the class does not need a hero- prefix. Use the same tag on matching elements across adjacent slides, and do not duplicate the same tag on one slide.
@column is intentionally unsupported; use @block.
Effective content alignment is block align → section align → centerLeft.
Use section alignment as a shared default and child alignment for exceptions.
flex is a positive integer. Section flex controls vertical height; child
block flex controls horizontal width.
Section spacing creates finite, non-negative gaps only between sibling
blocks and affects horizontal space allocation. Block margin is consumed
inside that block's allocated frame, outside its decoration/border — it
reduces only that block's own usable area, never creates a shared gutter,
and never changes flex ratios (unlike CSS margins; use section spacing for
gutters). Block padding is consumed inside the decorated container,
between the border and the content. Both accept scalar, symmetric, or
physical-edge forms. Omitted object edges normalize to zero; explicit null
edges are invalid. An absent override inherits the resolved style value for
that inset; an explicit 0 removes it. A present override
replaces only the matching inset after variants resolve while preserving
other style data (decoration, clipping, animation).
SlideStyler.blockContainer accepts BlockStyler, a constrained Mix styler
supporting only padding, , , ,
, context/ variants, and animation. It cannot
express widget modifiers, width/height/constraints, transforms, or box
alignment; use for other style slots (, code
block containers, alert containers).
Source Map
Use these files to resolve disputes or update this skill:
scrollable is valid on @block and widget blocks, not on @section.
layout: fullscreen removes resolved header/footer chrome while retaining the slide's resolved background and style. normal is the default.
Built-ins image, dartpad, webview, and qrcode are always registered and can be overridden by user widgets with the same name.
@image scale is a finite number greater than zero. It changes painting, not
layout, and clips using the effective alignment and image/content frame.
@dartpad and @webview use the same deck-scoped WebView controller cache. A cacheKey enables sequential reuse across remounts, never concurrent sharing by two live blocks.
Custom widgets must be registered in DeckOptions.widgets; use shorthand @widgetName { ... } in slides.md for registered widget names.
BlockVariant('name') is a Dart/Mix stylesheet selector for all WidgetBlocks with that exact, case-sensitive name. It affects the matching container and its widget subtree, not @block content.
Styles, templates, widgets, slide parts, and plugins are configured in Dart through DeckOptions/SuperDeckApp, not through a separate styles.yaml.
The CLI reads slides.md, writes .superdeck/superdeck.json, and ensures .superdeck/ is listed in Flutter assets unless --skip-pubspec is used.
DeckOptions(debug: true) diagnoses non-scrollable Markdown and custom
widget overflow without changing Markdown wrapping or rebuilding content;
static capture omits diagnostics.
