The Less compilers that I'm using (OrangeBits and dotless 1.3.0.5) are aggressively translating
body { width: calc(100% - 250px - 1.5em); }
into
body { width: calc(-151.5%); }
Which is obviously not desired. I'm wondering if there is a way to signal to the Less compiler to essentially ignore the attribute during compilation. I've searched through the Less documentation and both compilers' documentation, and I could not find anything.
Does Less or a Less compiler support this?
If not, is there a CSS extender that does?
Less no longer evaluates expression inside calc by default since v3.00.
Original answer (Less v1.x...2.x):
Do this:
body { width: calc(~"100% - 250px - 1.5em"); }
In Less 1.4.0 we will have a strictMaths option which requires all Less calculations to be within brackets, so the calc will work "out-of-the-box". This is an option since it is a major breaking change. Early betas of 1.4.0 had this option on by default. The release version has it off by default.