Card layouts are popular on the web, rows and columns of boxes with similar content. CSS grids can help align those cards, but it can still be hard to line-up content inside the cards: headers and footers that might need more or less room. That's why we need "subgrid" – coming in Firefox 71 and available now in Firefox Nightly. This is a great opportunity to quickly enhance our designs for modern browsers, without losing anything in the browsers without subgrid support. I'll show you how! Demo: #subgrid #CSSGrid #miriamsuzanne