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05-compatibility-gaps.md

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Compatibility Watchlist

This deck mixes current Marp compatibility gaps with targeted regression checks for features that were implemented recently.

Use it to keep unsupported behavior easy to reproduce while also guarding against regressions in newly supported directives.

Heading Divider

headingDivider is now implemented — this deck uses headingDivider: 2 in front matter, so ## headings create automatic slide breaks.

Implemented Spot Directive

The _backgroundColor syntax is now implemented here.

This slide remains in the watchlist deck as a quick visual regression check that spot overrides still apply to a single slide only.

Background Image Syntax

bg

Upstream Marpit treats bg as a background image keyword. The current implementation treats this as a normal image with alt text.

Fragmented List Syntax

  • Item one
  • Item two

Math And Fit

Inline math like $E = mc^2$ and fit comments such as # <!-- fit --> are useful future compatibility checks, but are not currently rendered with Marp semantics.

Background Size: Contain

When backgroundSize: contain is set, the background image should be fitted within the slide without cropping.

Background Size: Cover (Default)

Without an explicit backgroundSize (or with cover), the background image should stretch to fill the slide, cropping if needed.