Una Kravets shows how to make layouts in CSS Grid with flexbox fallbacks for browsers that don’t support those grid properties just yet. Una writes:
CSS grid is AMAZING! However, if you need to support users of IE11 and below, or Edge 15 and below, grid won’t really work as you expect…This site is a solution for you so you can start to progressively enhance without fear!
The site is a provides examples using common layouts and component patterns, including code snippets. For example:
See the Pen Grid To Flex — Example 1 by Una Kravets (@una) on CodePen.
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If we put four grid items in there, here’s what it looks like when inspecting it in Firefox DevTools:
Now let’s target one of those grid items and give it a background-color:
The grid item and the element are the same size!
There is a very specific reason for that though. It’s because the default value for justify-items and align-items is stretch. The value of stretch literally stretches the item to fill the grid area.
But there are several reasons why the element might not fill a grid area:
On the grid parent, justify-items or align-items is some non-stretch value.
On the grid element, align-self or justify-self is some non-stretch value.
On the grid element, if height or width is constrained.
I dunno it just feels useful to know that when placing an element in a grid area, that’s just the starting point for layout. It’ll fill the area by default, but it doesn’t have to. It could be smaller or bigger. It could be aligned into any of the corners or centered.
Perhaps the most interesting limitation is that you can’t target the grid area itself. If you want to take advantage of alignment, for example, you’re giving up the promise of filling the entire grid area. So you can’t apply a background and know it will cover that whole grid area anymore. If you need to take advantage of alignment and apply a covering background, you’ll need to leave it to stretch, make the new element display: grid; also, and use that for alignemnt.
Grid areas and the element that occupies them aren’t necessarily the same size. is a post from CSS-Tricks