Keynote for iCloud (the web-based version of iWork's Keynote) has close-to-feature-parity with the macOS/iOS versions.
Additionally, Keynote Live allows you to play a presentation and have viewers join via a URL, where they can view the presentation in sync on any device (macOS/iOS/Web), with feature parity to normal Keynote presentations.
Additionally, Keynote Live allows you to play a presentation and have viewers join via a URL, where they can view the presentation in sync on any device (macOS/iOS/Web), with feature parity to normal Keynote presentations.
https://support.apple.com/en-us/HT206205