See below CSS Variables are far more powerful than anything a preprocessor can give you. This is not about replacement of one technology with another but to evolve the standards we agreed on quite some time ago. I have yet to see an enterprise company that supports a Sass workflow.
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Standardisation allows code to be used by everyone. This seems like such a waste of time - Your time would be better spend contributing to Sass. More overhead for developers is dealing with something that really doesn’t need to exist. This is what gives them power, but also means overhead for developers. A lot of them, all in different ways and as part of a build process. December 15th, 2013 at 11:54ĬSS preprocessors do more then variables…. Why so verbose? December 15th, 2013 at 11:42Ĭool, this means that we won’t need any css pre-compiler in the future. OTH, pure CSS is way too limited for my use cases even during development so I have to live with all that overhead for now. are needed but not during development) to have changes reflected instantly. I’d like to cut that middleman during development (things like sprites, concatenation, minification etc. It hampers productivity that I have to either experiment with CSS in the browser and then re-apply changes to my Sass files or modify Sass files and wait for seconds before the change appears in the browser. I’d say, though, that there are many more things that CSS variables can do & Sass ones can’t than vice-versa.Ī build step during development is, as Chris mentioned, an overhead to developers. Custom Properties were designed in collaboration with lots of intetests, the maintainer of sass, chris eppstein, was involved and influential – this isn’t where we stop, it’s where we start. They also open new worlds to things that -use- selectors but are not themselves css. There is overlap, but these features will make css better and will lead to things like sass continuing to innovate on top of them. Flash tunnels were the norm, why wasn’t there a element? December 15th, 2013 at 12:06ĬSS variables do things that preprocessors cannot and vice-versa. The concept of a “widespread industry practice” is a fallacy. This is a common knee-jerk reaction to anything that comes out from the W3C it seems. They are uniquely gifted at creating ungainly and ugly standards when widespread industry practices are already commonly used (less, sass). Since CSS variables (aka custom properties) work differently than the ones in LESS or SASS, so their syntax can’t be reused.Īlso as far as I saw there were already long discussions about what syntax to choose and they agreed on the “var-” syntax. Good feedback to give the W3C on the open mailing lists they offer. $foo and are much easier to type and read. Would it be too taxing to parse variables of the form found in Less or SASS? We’ve been wanting native CSS variables for a long time. Sign up for the Mozilla Developer Newsletter:įirst of all, congrats on landing this. articles by Chris Heilmann… Discover great resources for web development.If you encounter any problems using the feature, please file a bug!įor now, have fun playing with CSS variables in Nightly and tell us about issues you find. The work for this feature was done in bug 773296, and my thanks to David Baron for doing the reviews there and to Emmanuele Bassi who did some initial work on the implementation.
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Note however that you can still get at them in the DOM by using the getPropertyValue and setProperty methods, as long as you use the full property names such as "var-theme-colour-1". The only part of the specification that has not yet been implemented is the CSSVariableMap part, which provides an object that behaves like an ECMAScript Map, with get, set and other methods, to get the values of variables on a CSSStyleDeclaration. There are still a few parts of the specification which still need to be supported before the can go into the release cycle of Firefox Beta and Firefox. Try resizing the window to less than 400 pixels to see the mediaQuery change in action.Īn initial implementation of CSS Variables has just landed in Firefox Nightly, which is currently at version 29 and after the February 3 merge, in Firefox Aurora. Var-smallmargin: calc(var(largemargin) / 2) īody This example shows many of these possibilities. You can also reset them to other values, for example inside a media query. Variables can be any value you want to define and you can use them like any other value, for example inside a calc() calculation. Using these settings, headings inside an element with a class of partnerbadge will now get the other blue settings:
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