currently we use https://zeplin.io/ for designer to developer communication.
Please add feature like this.

Agree 100%. This would make Xd a really useful pro tool.

I am a UI designer from Beijing, I feel very excited about XD. But I also have a few questions with it. The most important thing is that I can't export the files into a smart tool like Zeplin, so I have to manually make the mark files for developers. It makes me very distressed. I hope you can give me some advice！Looking forward to your reply, thank you very much！

The ability to Redline parts of a UI to communicate with development. Similar to the Sketch Measure plugin.

https://github.com/utom/sketch-measure

inVision has developed a photoshop extension for Photoshop and Sketch called Craft. The thing is the most powerful part of Craft is the styleguide functionality but that is exclusively for Sketch. I would love that functionality within Photoshop and Experience Design.

Marketch, PNG Express, Specking, Zeplin, Avocode, Craft, Markly

The ability to create a Design Guidelines file which shows padding, font sizes and styles for each of the font styles (e.g. h1, h2, h3, p etc)...and colour references of fonts, buttons etc.

Could be something within the file or something that is automatically created and exported when you export the assets of the design.

It would hugely increase the speed of workflow as I wouldn't have to manually create it, it would also make the transition from design to dev smoother as they have all the values there in black and white (rather than me checking it over multiple times to make sure they have got it right).

It's also something that can be kept with the design to make sure features added later or by a different designer adhere to the guidelines first produced helping towards consistency.

A CSS, Code, GUI mode for front-end developers

Make it compatible at least with Adobe extract - Allows a workflow like Sketch + Zeplin

In addition to the specs created by Measure plugin, consider the spec capabilities in the Notebook plugin. In enterprise companies, we create detailed designs with behaviors specs (e.g., When button ___ is pressed, ___ will happen. etc). Need ability to create spec meta data for objects and then export it into document.

There is a plugin called 'measure' that I use all the time in sketch for it's 'spec export' feature. It converts my designs to HTML so I can share them with engineers. I don't have to create detailed style guides when I use it. If I don't have this feature, I can't switch over from sketch. It's a huge efficiency in my workflow.

We are very much in early stages of a very ambitious project. Early on, we got a lot of feedback that customers wanted export capabilities with redlines, annotations and more control over exported assets, so, we are looking at various solutions for these use case. For now, you can export one or more selected objects on the canvas to various scales, but, you won't get any sort of spec or redlines.

Needs Guide Specs for distance in between objects and layers.

it's not without reason called a beta, it's officially out but still in beta so it might eventually be implemented if Adobe notices it.. I personally never used Zeplin so far, but it's always good to have different options for the user.. such as Export as PSD, which is still a demand today, like god knows why!

Okay, so we've gone from the Beta to a publicly available app. If I've missed it my apologies, but I can't see it. Can XD export screens with px specification, colour etc. out to Zeplin or something that's equivalent? If not, then this is a dead duck.