Add the posibility to define a transition effect for certain slides which overrides the global one.

Make it possible to drag and drop slides. To reorder the slides.

Provide ability to link to another slide instead of just a website. I'd love to use this format for a portfolio but don't want to make others have to scroll through to find what they want.

I'd love the ability to add custom code, like for embedding an iFrame.
Also, be able to use custom fonts, usually via services like Typekit, Google Fonts etc.

https://gfycat.com/AnotherIllCirriped

When I try to change the background colour I can't accurately see it until I close the menu. It darkens the slide and doesn't provide show the accurate colour.

Improve error messaging when embedding iframes into a deck.

Right now, if I embed an iframe that causes it to not load via setting a bad X-Frame-Options value it shows the same message if the iframe fails to load because of a mixed content error (e.g. trying to embed an HTTP page inside a frame on an HTTPS page)

Would be great if I this could be improved. Spent 15 frustrating minutes messing about with X-Frame-Options before I realised it was mixed content and the message was too generic!

On laptops with small screens the black sidebar takes up too much space. When editing large slides, the editable space is clipped and you can't access the entire slide because there is no way to scroll the editor or hide the sidebar. Please add a toggle to the top level and contextual options in the sidebar to hide them when editing slides.

In the editor settings one you can check the "Grid" option which "displays a grid *behind* the slide to help aligning". It would be nice to have an option for positioning the grid *in front of* the slide because when I want to overlap several larger elements then the first one already covers the grid and since that part of the grid is not visible anymore it consequentially doesn't help aligning anymore (apart from snapping).

"Creating ZIP" for several minutes, then back to "Download ZIP" without download.

Same behaviour on various browsers and OS.

Pro Plan.

Add the possibility to add fragments to the lines of an outline, ie a nested ordered or un ordered list. This already work at the first level of a list but doesn't work if you have a lists inside a lists inside a list...

- first
- first on first
- second on first
- second
- first on second

Using HTML editor on developer mode I add some sub and sup HTML tags, for example to add an exponent. The text is moved up/down but with the same font size. Maybe this Wikipedia text is helpful: "the superscript *is about 60% of the original characters*, raised by about 44% above the baseline".

I show code snippets a lot, and it would be convenient for the audience to be able to have a copy-to-clipboard option. Yes, they can drag and select, but for larger code samples, that's awkward.

The new drag and drop feature for the slide arrangement is awesome, but it broke my editing workflow.

I move between slides a lot during editing, so I used to press "esc" -> "arrow keys" -> "enter" to move from one slide to another. With the current version (Feb 2018) "enter" is not recognized anymore when opening the "slides overview" in edit mode.

Works perfectly in presentation mode, btw.

Twig is a pretty popular template engine for PHP and it misses in the list of selectable languages in the code editor although highlight.js supports it: https://github.com/isagalaev/highlight.js/blob/master/src/languages/twig.js

Would be great, having it on the list.

Suppose there's an object (e.g., arrow) directly below a text box containing LaTeX math stuff, in such a way that:
when entering the text box to edit the text, the formula expands to the original LaTeX source, taking up more text lines than the formula itself.

The textbox is made larger (expanded downwards), and the object directly below it is pushed down. When leaving the text box, the LaTeX source is replaced by the much shorter formula, the textbox shrinks, but the object below it doesn't return to the original position.

It would be nice if I could set padding for code blocks

I would like to let fragments on slides readable but losing some opacity when fading in the next fragment. So viewers follow my speed of speech, but may still see the last topic on that slide.