Changes

• Gradient slide backgrounds, read the docs 🌈 (@gcmznt in #2510)
• If multiple separate notes are provided for the same slide they will now all show in the speaker view (@lechten in #3010)
• Updated browser targets from > 0.5%, IE 11, not dead to > 2%, not dead
• Stop using zoom for presentation scaling. Zoom produced sharper upsizing than CSS transforms but it's a non-standard CSS property with a few too many quirks. e281b32

Fixes

• Fix issue where speaker view wasn't syncing (@hakimel #3285)
• Fix incorrect slide numbers when exporting vertical slides to PDF (@chivongv in 3182)
• Fix inconsistent fragment visibility in looped presentations (@hakimel in #3123)
• Fix bug where r-fit-text caused text to truncate in PDF exports (@hakimel in #3120)
• Fix bug where auto-animate could interfere with inherited line-height (@hakimel)

Full Changelog: 4.3.1...4.4.0

What's Changed

• Fix bug that prevented speaker view from working from file:// protocol (@hakimel #3158)
• Fix console errors attempting to parse postMessage events from sources other than reveal.js (@hakimel)
• Fix issue with providing your own config for MathJax3 plugin (@eric-wieser in #3157)
• Fix ZIP package gulp task (@dennybiasiolli in #3156)
• Replace deprecated String.prototype.substr() (@CommanderRoot in #3165)

Full Changelog: 4.3.0...4.3.1

tldr — self-destruction and bug fixes 💣

Changes

• It's now possible to destroy/uninitialize a reveal.js presentation. This will remove all event listeners and roll back all changes made to the DOM. It will also unregister all plugins and destroy them if they expose a destroy method. (#1145 / @hakimel)

  Reveal.destroy();

• You can now provide an absolute URL to the presentation that should be loaded in the speaker view. This is useful if you have a presentation integrated as part of a web page but still want the speaker view to work.

  Reveal.initialize({ url: 'https://example.com/my-reveal-presentation' })

• Source maps are now included in dist (#3082 / @dabrahams)

Fixes

• Fix the speaker view no longer goes out of sync with your presentation after live-reloading (#2822 / @hakimel).
• Fix XSS vulnerability in speaker view (#3137 / @r0hanSH)
• Fix issues with scaling embedded presentations when entering fullscreen mode in Safari (#3080 / @Martinomagnifico)

Bug fix release 🐛

Fixes

• Fix an issue where some slides disappeared (fully or partially) after slide transitions in Chrome (9e583b8 @hakimel)
• Fix an issue that caused double-navigations and impacted presentation performance (@hakimel #3079)
• Fix --host not working in npm start -- --host=0.0.0.0 (@cashcat #3075)
• Fix incorrect sizing of auto-sized text in PDF exports (#2865 (comment) @hakimel)
• Fix background video playback issue in some browsers by inferring MIME type from file extension (#3078 @vanch3d)

Changes

• The math plugin now supports three typesetting libraries: KaTeX, MathJax 2 and MathJax 3. We continue to use MathJax 2 as our default so this is fully backwards compatible. Learn how to choose between typesetters and how to configure them in the docs at https://revealjs.com/math#typesetting-libraries (@burgerga in #2559).
• New event: beforeslidechange (#3003). This makes it possible to conditionally prevent navigations:

  // This prevents all slide changes
  Reveal.addEventListener( 'beforeslidechange', e => e.preventDefault() );

• New keyboard shortcut for skipping fragments while navigating: alt + ←/↑/→/↓.
• New API option for skipping fragments in directional navigation Reveal.right({ skipFragments: true }).
• Adds a beforeHighlight callback to the highlight plugin (@rajgoel in #3026).

  Reveal.initialize({ 
    highlight: {
      beforeHighlight: (hljs) => {
        // interact with highlight.js, for example to register a new language
      }
    } 
  })

• Code line numbers can now start from an offset (#3050). For example, this code block would begin its line numbering from 10: <code data-ln-start-from="10">.
• Better error messaging when the .reveal or .slides containers are missing #2217.

Fixes

• The last slide keyboard shortcut now works for looped presentations (#3007).
• Markdown code blocks can be turned into fragments (@nicojs in #2982).
• Unit tests can now run in Windows (@Vandivier in #3027).
• Restored support for base64 background images, broken since 4.1.1 (#2978).
• Fixes an issue that prevented presentations from looping when navigationMode was set to linear.
• Internal links leading to a slide with video/audio element will now correctly start media playback. This issue only affected mobile browsers.

Changes

• Adds support for data-auto-animate-restart and data-auto-animate-id. These properties give you finer control over which slides that should auto-animate between each other (@coffeenotfound in #2896).
• Theme properties are now available as CSS variables, making them easy to override. Full list of variables (#2740 + #2968).
  Here's an example you can drop into your presentation's HTML:

<style type="text/css">
:root {
  --r-background-color: indigo;
  --r-main-color: #f5f5f5;
  --r-main-font: monospace;
}
</style>

Fixes

• Markdown enabled speaker notes (<aside class="notes" data-markdown>) are no longer visible on-slide.

Mostly bug fixes and enhancements 🐛

Changes

• Adds support for Node.js 16.
• data-background-image now accepts multiple images (#2940).
• New Markdown config option animateLists — automatically turns all lists into stepped fragments (#2956).
• Reduce the tab size in code blocks from 8 to 2.
• More accurate calculation of which slide to jump to when clicking on the progress bar (#2836).
• Optimize DOM interactions and reduce forced layouts when exporting to PDF (#2843).

Fixes

• Video/audio inside of a fragment now stop playing when the fragment is hidden.
• Markdown is now split into individual slides by the default separator (---) as advertised.
• The r-fit-text layout helper now sizes text correctly in PDF exports.
• Fixes an issue where some slide-specific transitions were incorrectly overridden by the global transition setting.
• The has-dark-background helper class now works when using named colors for data-background-color (#2933).

Changes

• New: Add data-visibility="hidden" to a slide to hide it from view. Docs & examples
• New: Add the r-fit-text class to make a text node grow to be as large as possible without overflowing the slide. Docs & examples
• The configured slide width/height is now exposed as CSS variables (--slide-width/--slide-height).
• The shuffle config option now shuffles vertical slides as well.
• All themes now invert the text color based on the current slide background color.
• Include /css and /js in npm package.

Fixes

• Don't append #/ to the URL on first slide.
• Don't fill the progress bar when there's only one slide in a deck
• Correct slide count when using data-visibility="uncounted" (#2675)

Changes

• Enables caching for JavaScript builds, making subsequent builds ~50% faster.
• In auto-sliding presentations, the data-autoslide attribute now takes precedence over automatic detection of <video> durations.
• Remove overzealous reset styles when printing to PDF.
• Reveal.configure and Reveal.isReady are now available in the pre-initialized reveal.js API, to match v3.x behavior.
• Switches to serving demo presentation assets from a CDN.

Bug fixes

• Fixes polyfills and adds IE 11 support.
• Fixes the progress bar direction in right-to-left mode.

Bug fixes

• Fixed issues when printing speaker notes to PDF (#2671 by @s-l-lee)
• Fixed incorrect auto-animations when there are multiple auto-animated presentations on the same page