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You make a number of columns dynamic by setting different percentage widths on different page sizes.

But then it's responsive to the page size, not the container size. That's a small, but important difference.

For instance, I recently made a component to be included on other pages at work. It had to look good no matter the size the page gave it. So they might put it into a 400px wide container, on a 1600px wide page. If I used vw or media queries to draw it based on page size, it would behave wrong.

I was thinking about that problem earlier. Is there not a CSS unit for container size? If not, that seems like a very useful addition. Like a more embedded version of vw/vh.

Percent can be based on container depending on how the container size is set.

Ah, of course you're right. Good point thank you.

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