I think IE 10 and 11 have partial CSS Grid support, so not all features will work. Here's an article about working with grid and those older browsers: medium.com/@elad/supporting-css-gr...
It's immensly important to know that in IE10 auto-placement isn't supported in grid, meaning you'd have to manually place every item.
To me, it's safer to build grid for the browsers that include full support and then include reasonable fallbacks for browsers that only partially support or don't support grid.
Even better to build the "fallback" first, then enhance with grid if @supports passes!
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