Dalliance is a genome viewing tool that aims to offer a high level of interactivity while working entirely within your web browser. It currently supports recent versions of Firefox, Google Chrome, and Safari.

To try it, visit http://www.biodalliance.org/human/ncbi36/.

You should be able to run Dalliance directly from a git checkout. You first need to download a couple of dependencies using:

      git submodule init
      git submodule update

Then point your web browser at the file test.html. Once you've confirmed this is working, you can customize your display by editing the block of configuration javascript within the HTML file.

Dalliance loads data via the DAS protocol, and aims towards full DAS/1.53 and DAS/1.6 support. There's a button to click that will let you add DAS sources. If what you're after is in the registry, you should just be able to select and add, otherwise you'll need to type a URL.

If you are running a very recent web browser, you can also add data directly from indexed binary files (currently bigwig and bigbed, perhaps other formats in the future). Binary files can either be hosted on a web server or loaded from local disk.

However, there is one caveat. Since Dalliance is a pure Javascript program running in your web browser, it is normally subject to the "same origin policy", which only permits Javascript code to access resources on the same server. To get round this, DAS servers need to support the W3C CORS extension. The latest versions of Dazzle, Proserver and MyDAS should implement this by default.

Dalliance has a nearly-complete implementation of the DAS/1.53 and DAS/1.6 stylesheet system, but is currently a little bit fussy about exactly how it interprets DAS stylesheets, so if your data doesn't appear, it's worth taking a careful look at your stylesheet and/or temporarily replacing it with something simple.

Dalliance is under active development and we welcome your suggestions. Right now, probably the best place for bug reports or feature requests is the Github issue tracker.