There are tons of great new quality-of-life features you can use in 3.3. Three key things you might want to try:

1. Themes can now ship static & dynamic assets in an /assets directory

In Jekyll 3.2, we shipped the ability to use a theme that was packaged as a gem. 3.2 included support for includes, layouts, and sass partials. In 3.3, we’re adding assets to that list.

In an effort to make theme management a bit easier, any files you put into /assets in your theme will be read in as though they were part of the user’s site. This means you can ship SCSS and CoffeeScript, images and webfonts, and so on – anything you’d consider a part of the presentation. Same rules apply here as in a Jekyll site: if it has YAML front matter, it will be converted and rendered. No YAML front matter, and it will simply be copied over like a static asset.

Note that if a user has a file of the same path, the theme content will not be included in the site, i.e. a user’s /assets/main.scss will be read and processed if present instead of a theme’s /assets/main.scss.

See our documentation on the subject for more info.

2. relative_url and absolute_url filters

Want a clean way to prepend the baseurl or url in your config? These new filters have you covered. When working locally, if you set your baseurl to match your deployment environment, say baseurl: "/myproject", then relative_url will ensure that this baseurl is prepended to anything you pass it:

{{ "/docs/assets/" | relative_url }} => /myproject/docs/assets

By default, baseurl is set to "" and therefore yields (never set to "/"):

{{ "/docs/assets/" | relative_url }} => /docs/assets

A result of relative_url will safely always produce a URL which is relative to the domain root. A similar principle applies to absolute_url. It prepends your baseurl and url values, making absolute URL’s all the easier to make:

{{ "/docs/assets/" | absolute_url }} =>

3. site.url is set by the development server

When you run jekyll serve locally, it starts a web server, usually at http://localhost:4000, that you use to preview your site during development. If you are using the new absolute_url filter, or using site.url anywhere, you have probably had to create a development config which resets the url value to point to http://localhost:4000.

No longer! When you run jekyll serve, Jekyll will build your site with the value of the host, port, and SSL-related options. This defaults to url: http://localhost:4000. When you are developing locally, site.url will yield http://localhost:4000.

This happens by default when running Jekyll locally. It will not be set if you set JEKYLL_ENV=production and run jekyll serve. If JEKYLL_ENV is any value except development (its default value), Jekyll will not overwrite the value of url in your config. And again, this only applies to serving, not to building.

A lot more!

There are dozens of bug fixes and minor improvements to make your Jekyll experience better than ever. With every Jekyll release, we strive to bring greater stability and reliability to your everyday development workflow.

As always, thanks to our many contributors who contributed countless hours of their free time to making this release happen:

Anatoliy Yastreb, Anthony Gaudino, Antonio, Ashwin Maroli, Ben Balter, Charles Horn, Chris Finazzo, Daniel Chapman, David Zhang, Eduardo Bouças, Edward Thomson, Eloy Espinaco, Florian Thomas, Frank Taillandier, Gerardo, Heng Kwokfu, Heng, K. (Stephen), Jeff Kolesky, Jonathan Thornton, Jordon Bedwell, Jussi Kinnula, Júnior Messias, Kyle O’Brien, Manmeet Gill, Mark H. Wilkinson, Marko Locher, Mertcan GÖKGÖZ, Michal Švácha, Mike Kasberg, Nadjib Amar, Nicolas Hoizey, Nicolas Porcel, Parker Moore, Pat Hawks, Patrick Marsceill, Stephen Checkoway, Stuart Kent, XhmikosR, Zlatan Vasović, mertkahyaoglu, shingo-nakanishi, and vohedge.

Full release notes are available for your perusal. If you notice any issues, please don’t hesitate to file a bug report.

Happy Jekylling!