Re: [css-ui-3] box-sizing: padding-box

On 6/13/2015 3:00 PM, Florian Rivoal wrote:
> Using calc to replace box-sizing is possible, and that's not specific to the padding-box value. But using box-sizing is supposed to make code easier to read understand and maintain.

I don't think having multiple box models makes code easier to understand and maintain.

|box-sizing| seems to be a patch for the reality that the CSS Working Group chose an inferior box model and isn't able to fix that. The |border-box| model is the most intuitive model and already in de facto, widespread use via the HTML |table| element, so it makes sense to keep |box-sizing: border-box|. The |padding-box| value seems to be something created for the sake of completeness. Completeness isn't an end unto itself; there needs to be a use case. The single use case you've shown isn't compelling.

On 6/13/2015 3:00 PM, Florian Rivoal wrote:
> So I agree we can drop padding-box and not lose functionality, but we lose expressivity.

You have expressivity in the form of the |calc| function.

Typically, cases where |box-sizing: padding-box| would be useful are also covered by |box-sizing: border-box|, so you can often use that too.