• Fix cross-origin XSS through the postMessage API by validating iframe preview URLs
• Fix Markdown attributes targeting the last list item instead of the whole list when separated by a blank line #3931
• Prevent offscreen slides from receiving keyboard focus #1587
• Fix pinch-to-zoom gestures incorrectly triggering slide changes
• Improve slide layout and scroll view performance
• Fix slides repeatedly loading and unloading while scrolling
• Scale navigation controls, progress bars and media buttons for mobile viewports
• Round slide scale to two decimal places
• Update dependencies to address security vulnerabilities. Building and developing reveal.js now requires Node.js 22.12 or later

Full Changelog: https://github.com/hakimel/reveal.js/compare/6.0.1...6.0.2

• Upgrade to Vite 8 and TS 6
• Blacklist previewIframe in postMessage API #3887
• Fix exception in media control removal during PDF exports #3888

Full Changelog: https://github.com/hakimel/reveal.js/compare/6.0.0...6.0.1

reveal.js now has an official React wrapper! The @revealjs/react package lets you build presentations using React components—<Deck>, <Slide>, <Stack>, <Fragment>, and <Code>. Learn more over at revealjs.com/react.

import { Deck, Slide, Fragment } from '@revealjs/react';

<Deck>
  <Slide>
    <h1>Hello World</h1>
    <Fragment asChild>
      <h2>Appears on click</h2>
    </Fragment>
  </Slide>
</Deck>

Try it out by pulling reveal.js master and running npm run react:demo.

See the full upgrade guide for step-by-step instructions. The short version:

• Plugin paths have moved —if your presentation HTML loads plugins directly from the file system or via CDN, update your paths from plugin/<name>/plugin.js to dist/plugin/<name>.js (e.g. plugin/notes/notes.js → dist/plugin/notes.js, plugin/highlight/monokai.css → dist/plugin/highlight/monokai.css)
• ES module paths renamed — .esm.js files are now .mjs (e.g. dist/reveal.esm.js → dist/reveal.mjs). If you import via bare module specifiers this doesn't affect you.
• CSS paths changed — if you install via npm, the dist/ prefix has been dropped from the public package API (e.g. reveal.js/dist/reveal.css → reveal.js/reveal.css).
• TypeScript — reveal.js now ships with types included. If you were previously using @types/reveal.js you can remove it and migrate. Note that the type names are slightly different, more info in the upgrade guide.

• Switch from gulp to Vite for building and running reveal.js (@hakimel)
• Add official React wrapper for reveal.js — @revealjs/react (@hakimel)
• TypeScript types are now published as part of the package, based on the great work over at @types/reveal
• Dark mode and llms.txt support for revealjs.com.
• Add controls: 'speaker' config option to show controls only in speaker view (@hakimel in #3853)
• Videos blocked from autoplaying with audio will now play muted with an unmute button, replacing the previous browser-dependent blocked state (@hakimel)
• MathJax 4 support in the math plugin (@Khlick in #3811)
• Accessibility improvements: alt tags on images and videos are now announced by screen readers, and slide content is better punctuated for screen reader text (@hakimel in #3757, #3772)
• sync() now also updates slide classes, fixing issues when adding or removing slides and then calling sync (@hakimel)
• A sync event is now dispatched when reveal.js syncs (@hakimel)
• Add removeHiddenSlides() to the API (@hakimel)
• data-id is now supported for slide links (@hakimel)
• data-preview-link value now takes precedence over the anchor's href (@hakimel in #3854)
• Prevent iframes from stealing keyboard focus, controllable via the new preventIframeAutoFocus config option (@hakimel)
• Pressing Enter on the active slide in overview mode now exits the overview and opens that slide (@tobi-or-not-tobi)
• The display config option now supports !important (@boba-beba)
• Distinct active/hover state difference in overview mode (@hakimel in #3780)

• Fix videos not autoplaying when navigating with control arrows on Android (@hakimel)
• Fix initial video autoplay not working on Android (@hakimel)
• Fix multiple videos started simultaneously sometimes failing to render in Mobile Safari (@hakimel)
• Fix overview mode missing slide thumbnails in adjacent stacks with more than 10 vertical slides (closes #3754) (@hakimel)
• Fix missing font in dracula theme (fixes #3781) (@hakimel)
• Fix SCSS deprecation warnings by refactoring all themes to latest Sass syntax (@hakimel)

Full Changelog: https://github.com/hakimel/reveal.js/compare/5.2.1...6.0.0

• Prevent reveal.js keyboard shortcuts while lightbox is open (@tobi-or-not-tobi in https://github.com/hakimel/reveal.js/pull/3767)
• Opening iframe lightboxes via [data-preview-link] now works all element types, not just <a> (@hakimel)
• Lightbox state is now persisted/restored when calling Reveal.getState and Reveal.setState (@hakimel)
• Lightbox now syncs between speaker view and main window (@hakimel)
• Fix pause overlay/lightbox layering conflict (@tobi-or-not-tobi in https://github.com/hakimel/reveal.js/pull/3768)
• Added lightbox example to demo.html

Full Changelog: https://github.com/hakimel/reveal.js/compare/5.2.0...5.2.1

Any element in your presentation can now be turned into an image/video lightbox trigger. Clicking reveals a full-size lightbox overlay where users can view your image or video. This is great for things like clickable thumbnails in a gallery.

<!-- Click to show "A.png" in an overlay -->
<img src="A.png" data-preview-image>

<!-- Click show "B.png" in an overlay -->
<img src="A.png" data-preview-image="B.png">

<!-- Click to show "C.mp4" in an overlay and scale it to "cover" -->
<img src="A.png" data-preview-video="C.mp4" data-preview-fit="cover">

<!-- Works with any element type -->
<button data-preview-video="C.mp4">Play video</button>

Docs: revealjs.com/lightbox.

Here's what it looks like in action:

https://github.com/user-attachments/assets/3d7d5885-8099-412c-b26d-ef294adbbb3d

• Upgrade to gulp 5.0.
• Add controls: "speaker-only" config option for only showing controls in speaker view (@gpotter2 in https://github.com/hakimel/reveal.js/pull/3716)
• Extend search API to include closeSearch and toggleSearch (@lechten in https://github.com/hakimel/reveal.js/pull/3685)
• Automatic source code spellcheck via GitHub action (@yarikoptic in https://github.com/hakimel/reveal.js/pull/3602)
• Math plugin now ignores code tags by default (@hakimel in 0d02d8a303a39b02c919d86c94ec477d1e1b107d)
• Muted background videos now autoplay in the speaker view.
• Prevent initialize from being called twice (@hakimel in 16ac4b00671a8ac6433091118c4ebd9b00255545)
• Auto-animate no longer skips matching fragments on adjacent slides (@hakimel in 6dea2a50941bf3be6824b3eadc5cb17feb87eb5b)

• Fix reveal.js not covering full viewport height in iOS by switching to 100dvh (@hakimel in 6cebb771eec18e244a23719f94baf0e70242abe7)
• Fix background video restarting when switching fragments from notes view (https://github.com/hakimel/reveal.js/issues/3633)
• Fix gulp package not working in gulp 5 (@dennybiasiolli in https://github.com/hakimel/reveal.js/pull/3701)
• Fix last slide not triggering slidechange event in scroll view (@hakimel in fe4a6e82b01df923085fa867656cf11180490465)

Full Changelog: https://github.com/hakimel/reveal.js/compare/5.1.0...5.2.0

• Add the enter-fullscreen class to any element in your presentation to turn it into fullscreen trigger (@hakimel)
• Video backgrounds now continue to play seamlessly across multiple slides (@hakimel)

https://github.com/hakimel/reveal.js/assets/629429/d1bcbced-5ede-4e2d-83fb-d3f3804eb674

• MathJax3 plugin now works with in non-singleton reveal.js instances (@jokester in https://github.com/hakimel/reveal.js/pull/3595)
• Changing slides via swipe gestures now works when swiping on videos—unless their controls are visible (@hakimel)
• Fix exception when destroying uninitialized reveal.js instance (@hakimel in #3593)
• Fix videos restarting each time a fragment is shown (@hakimel in #2882)
• Fix broken backwards navigation in RTL mode (@hakimel)
• Fix error when the notes plugin receives a non-string message (@NatKarmios in https://github.com/hakimel/reveal.js/pull/3588)
• Fix question mark shortcut on non-English keyboard layouts (@lechten in https://github.com/hakimel/reveal.js/pull/3603)
• Fix r-stack overflow behavior in Chromium browsers (@alifeee in https://github.com/hakimel/reveal.js/pull/3598)

Full Changelog: https://github.com/hakimel/reveal.js/compare/5.0.5...5.1.0

• Keyboard navigation support in scroll view (@hakimel in #3515)
• Add F1 shortcut for showing help overlay (@gchriz in #3570)

• Fix postMessage XSS exploit (@hakimel in 3dade6117628beb7706b4abdc61c268ce281abbc)
• Fix stack backgrounds not working in scroll view (@bouzidanas in #3568)
• Fix fragmentshown and fragmenthidden not firing in scroll view (@bouzidanas, @ hakimel in #3580)

Full Changelog: https://github.com/hakimel/reveal.js/compare/5.0.4...5.0.5

• Missing slide backgrounds in mobile scroll view (#3554)

• Search plugin now supports searching for diacritics and searches full phrases (@t-fritsch in #3532)
• Jump-to-slide now adapts to the configured slide number format (@hakimel in #3501)
• Slide background XSS prevention (@EastSun5566 in https://github.com/hakimel/reveal.js/pull/3548)

• Fix speaker notes not appearing in PDF exports (@hakimel in #3535)
• Fix exception when stepping backwards through code highlights (@hakimel in #3524)
• Fix exception when navigating decks in mobile browsers (@hakimel in #3539)
• Fix pause/help overlay position in scroll view (@hakimel in #3542)
• Fix mobile scroll view navigation when fragments began at a index higher than 1 (@hakimel #3540)

Full Changelog: https://github.com/hakimel/reveal.js/compare/5.0.2...5.0.3

• Upgrade dependencies (@Mister-Hope in https://github.com/hakimel/reveal.js/pull/3505)
• Make Markdown plugin callable without a reveal deck instance (@hakimel in https://github.com/hakimel/reveal.js/issues/3517)
• Fix exception in speaker view (@hakimel #2512)
• Fix issue where a future vertical slide background sometimes flashed into view prematurely (@hakimel in https://github.com/hakimel/reveal.js/issues/3520)

Full Changelog: https://github.com/hakimel/reveal.js/compare/5.0.0...5.0.2