webyarns-3.8.0

Based on 3.8.0

Breaking changes

• data-next-idx has neen renamed to data-next-slide-indexh and the value given is the indexh value of the target slide

See for other changes in upstream reveal.js:

• 3.3.0
• 3.4.0
• 3.5.0
• 3.6.0
• 3.7.0
• 3.8.0