Firefox to implement calc() in CSS3.
June 14th 2010
I’ve just read last week that Firefox would implement calc() in their new version of Firefox. It’s not out in any publicly released version yet but it is coming as they talked about it on their developers blog.
Why should you care?
Ever had an element that needed to have a percentage width with padding? Up until now, because of the way the box model works in
Firefox modern browsers, you had to wrap the content in a container to which you’d apply the padding. That’s because when you define padding to an element the value is added to the width, which is the proper way of doing it.
Now the thing is that percentage width don’t mix well with fixed padding values, that where calc() comes into play.
Lets say you have a box with the following css rules:
If that box is in a container 1000 pixels wide, the box would be 640 pixels wide total, that’s not what you want, that’s not 60% wide! You coud use calc() to achieve the desired result:
width: -moz-calc(60% - 40px);
You can even be wild and do basic calculations in there:
width: -moz-calc(60% - 2 * 20px);
Taking it further
What would be even cooler is if you could get the actual padding values as a variable in calc(). Something like:
width: -moz-calc(60% - (padding-left + padding-right));
This way you could even forget about updating your width value when you play with your padding.
Oh well, one day maybe, now let’s just see if other browser vendors implement something of the like. Let’s not forget this is not part of the W3C CSS3 specs.
Is it a feature you were waiting for?
[…] This post was mentioned on Twitter by Stephane Caron, montrealhackers. montrealhackers said: Firefox to implement calc() in CSS3. http://bit.ly/cIlG79 […]
firefox not fast browser, and error of nature. )) value like -moz-* i think not valid by validation w3c. use this values may requires fixes for IE ((
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“Is it a feature you were waiting for?”
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Thank you! I hope to see more updates from you. Firefox changed a lot from 2010, with new appearance and I think the speed is improved a little.
I agree with your opinion, I’m sure your ideas will be successful in the future!
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