chore(deps): update dependency reveal.js to v4 (master)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
reveal.js (source)	3.9.2 -> 4.2.1

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Release Notes

hakimel/reveal.js

v4.2.1

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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 (Printing With r-fit-text Too Big hakimel/reveal.js#2865 (comment) @​hakimel)
• Fix background video playback issue in some browsers by inferring MIME type from file extension (#​3078 @​vanch3d)

v4.2.0

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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.

v4.1.3

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v4.1.2

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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.

v4.1.1

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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).

v4.1.0

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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)

v4.0.2

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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.

v4.0.1

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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

v4.0.0

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Breaking Changes 🚨

This release includes a small number of breaking changes. Please read the Upgrade Instructions if you want to migrate an existing presentation.

Highlights

• New website, docs and logo! https://revealjs.com/ 🚀
• Auto-Animate lets you create complex animations by automatically transitioning between matched elements across slides. Duration, delay and easing can be set on a per-slide or per-element basis.
• We now support multiple presentations on the same page.
  • This also introduces a new embedded config option, which allows presentations to reside within a portion of a page. Previously reveal.js always covered 100% of the page width and height.
  • The new keyboardCondition: 'focused' config option lets presentations capture keyboard events only when they're focused by the viewer.
• The reveal.js core and built-in plugins have been rewritten as ES modules. This makes the project easier to maintain and makes reveal.js itself easier to include in a bundle. Two bundles are provided:
  • dist/reveal.js uses UMD and has broad cross browser support (ES5).
  • dist/reveal.esm.js is an ES module. More info
• Code highlights are now automatically scrolled into view and it looks soooo good. You've got to try it out.

Changes

• The Reveal.initialize method now returns a promise that resolves once reveal.js is ready and all plugins have finished initializing.
• Switches build systems from to gulp, using rollup for bundling.
• Moves all compiled CSS (reveal.css, reset.css and themes) from css/ to dist/. See Upgrade Instructions.
• Moves all print CSS into reveal.js. The old script-based print styles can be removed. by @​quilicicf
• Adds a new slidetransitionend event.
• Adds a new r-stack layout helper for placing elements on top of each other.
• Adds support for data-visibility="uncounted" to exclude slides from the progress bar and slide number count. #​2543 by @​lassepe
• Adds Reveal.getComputedSlideSize API method.
• Renames the Reveal.addEventListener and Reveal.removeEventListener API methods to Reveal.on and Reveal.off. Old names are aliased for backwards compatibility.
• Removes the default border style from <img>s. Can be added with the r-frame class.
• Removes bower.json.

Plugins

• New syntax for registering plugins.
• All built-in plugins—such as markdown and highlight—are now available as ES modules. More info
• Notes: No longer depends on resolving an external notes.html file to work. Everything is baked into the plugin JS.
• Highlight: Upgraded to highlight.js 10.0.1.
• Highlight: Moved highlight themes from lib/css/monokai.css to plugin/highlight/monokai.css.
• Highlight: 'highlight.js' library is now installed from npm instead of being saved in the repo.
• Markdown: Support for line numbers and highlights in syntax highlighted code.
• Markdown: Support for boolean data- attributes. by @​Bagira80
• Markdown: 'marked' library is now installed from npm instead of being saved in the repo.
• Multiplex: Moved out to https://github.com/reveal/multiplex
• Notes Server: Moved out to https://github.com/reveal/notes-server

Bug fixes

• Fixes a bug that prevented links from working in exported PDFs. #​2628 by @​telliott22
• Fixes a bug where navigationMode: 'linear' incorrectly hid valid vertical directions. #​2582 by @​earboxer
• Fixes an issue that caused reveal.js to incorrectly block keyboard events when an element with contentedtable=false was focused. #​2650

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