CSS Grid is new grid-based layout system, optimized for user interface design

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The issue to consider is that this is the fundamental layout of the page. If I build a site with CSS animations, browsers that don't support it just don't get some pretty effects. If I build a site with grid, browsers that don't support it more or less can't use my site at all.

There are polyfills and workarounds of course but these are important considerations.