[FEATURE] Support mixing horizontal and vertical slides when exporting to HTML

[jeertmans]

Terms

• Checked the existing issues and discussions to see if my issue had not already been reported;

Description

As discussed in #568, mixing vertical and horizontal slides could be a nice feature to add to the HTML export format.

A possible implementation could be (copied from #568 (reply in thread)):

That makes sense! Looking back at https://revealjs.com/vertical-slides/, maybe a simpler solution could be to have all slides in vertical mode by default, and have a special keyword in next_slide that triggers a new horizontal mode. To provide the same behavior as previously, we could check afterward if the presentation only has one horizontal slide and, if that's the case, unravel all vertical slides into horizontal ones.

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Additional information

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