In this particular scenario, the query arises whether the CSS calc() function extends its support to the fr unit as presented in the below example?
.sample-grid {
--main-fr: 60fr;
grid-template-columns: var(--main-fr) 1rem calc(100 - var(--main-fr));
}
At first glance, my assumption is that it doesn't work with either Firefox or Chrome.
It is important to note that, as per the official specifications, the 'fr' unit does not behave like traditional length units.
Section 7.2.3 of the specs discusses Flexible Lengths: the 'fr' unit
The 'fr' unit represents a fraction of the leftover space in the grid container, making tracks sized with 'fr' units flexible and responsive to available space, similar to flex items in a flex container.
It's worth noting that 'fr' values are unique and cannot be treated as lengths or combined with other unit types in 'calc()' expressions.
emphasis added
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