Reply To: [Solved] calc not always working in IE

[Paulie_D]

I’m guessing (although you say this is a ‘sometimes’ problem) that IE is having trouble with calc of 100% when it may not know what 100% means.

Usually, the 100% will refer back to a specific value…all the way up the DOM and if that’s not 100% on the html & body elements it’ll break.