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 https://github.com/hakimel/reveal.js/pull/3157)
• Fix ZIP package gulp task (@dennybiasiolli in https://github.com/hakimel/reveal.js/pull/3156)
• Replace deprecated String.prototype.substr() (@CommanderRoot in https://github.com/hakimel/reveal.js/pull/3165)

Full Changelog: https://github.com/hakimel/reveal.js/compare/4.3.0...4.3.1