Re: [w3ctag/design-reviews] [CSS-Values-4] FYI review of Allow infinity, -infinity and NaN in CSS calc() (Issue #708)

Hi @DevSDK,

We briefly looked at this today during a breakout and had a question. We were a little troubled by:

> According to the [spec](https://www.w3.org/TR/css-values-4/#top-level-calculation), It says "If a top-level calculation (a math function not nested inside of another math function) would produce a value whose numeric part is NaN, it instead act as though the numeric part is +∞." Therefore NaN will be calculated as positive infinity.

What is the reasoning to make NaN behave as +Infinity?

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