npm / reveal.js

reveal.js

What changed in reveal.js 6, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-30.

8 breaking2 security6 new APIs and options1 performance4 behavior and defaults1 tooling10 fixes and other

See which of these apply to your code, ranked, in your agent:

npx @unstale/cli init

reveal.js 632 changes

Building and developing reveal.js now requires Node.js 22.12 or later.
6.0.2release notes
The data-preview-link value now takes precedence over the anchor's href.
6.0.0release notes
ES module files now use the .mjs extension; update direct file imports. Bare module specifier imports are unaffected.
6.0.0release notes
The project switches from gulp to Vite for building and running reveal.js.
6.0.0release notes
Pressing Enter on the active slide in overview mode now exits overview and opens that slide.
6.0.0release notes
Plugin files have moved from plugin/<name>/plugin.js to dist/plugin/<name>.js; update paths when loading plugins from the file system or a CDN.
6.0.0release notes
The dist/ prefix has been dropped from the public npm package CSS path.
6.0.0release notes
Videos blocked from autoplaying with audio now play muted and show an unmute button instead of using the previous browser-dependent blocked state.
6.0.0release notes

Iframe preview URLs are validated to fix cross-origin XSS through the postMessage API.
6.0.2release notes
Blacklists previewIframe in the postMessage API.
6.0.1release notes

The controls: 'speaker' option shows controls only in speaker view.
6.0.0release notes
Slide links now support the data-id attribute.
6.0.0release notes
The new configuration option controls whether iframes are prevented from stealing keyboard focus.
6.0.0release notes
The API adds removeHiddenSlides().
6.0.0release notes
An official React wrapper lets you build presentations using the Deck, Slide, Stack, Fragment, and Code components.
6.0.0release notes
A sync event is dispatched when reveal.js syncs.
6.0.0release notes

Navigation controls, progress bars and media buttons scale for mobile viewports.
6.0.2release notes
The display configuration option now supports !important.
6.0.0release notes
The math plugin supports MathJax 4.
6.0.0release notes
Screen readers now announce image and video alt tags, and slide content is better punctuated in screen reader text.
6.0.0release notes

TypeScript types are now included in the reveal.js package; users previously relying on @types/reveal.js can remove it and migrate to the included types.
6.0.0release notes

Markdown attributes target the whole list rather than only the last list item when separated by a blank line.
6.0.2release notes
Offscreen slides no longer receive keyboard focus.
6.0.2release notes
Pinch-to-zoom gestures no longer incorrectly trigger slide changes.
6.0.2release notes
Slide scale is rounded to two decimal places.
6.0.2release notes
Slides no longer repeatedly load and unload while scrolling.
6.0.2release notes
Fixes an exception during media control removal in PDF exports.
6.0.1release notes
Fixes cases where multiple videos started simultaneously sometimes failed to render in Mobile Safari.
6.0.0release notes
Fixes missing thumbnails in adjacent stacks with more than 10 vertical slides.
6.0.0release notes
Calling sync() now also updates slide classes, fixing issues after adding or removing slides.
6.0.0release notes
Fixes videos not autoplaying on Android when navigating with control arrows and when autoplaying initially.
6.0.0release notes