grid.css

.a {
  display: grid;
  grid-template-columns: auto 1fr;
  justify-self: stretch;
  align-self: stretch;
  grid-column-start: 1;
  grid-column-end: span 3;
}

.b {
  display: inline-grid;
  grid-template-rows: 10px repeat(4, 250px 10px) 20px;
  justify-self: stretch;
  align-self: stretch;
  grid-row-start: 1;
  grid-row-end: span 3;
}

.c {
  grid-column: 1 / span 3;
}

.d {
  grid-column: 1 / 3;
  grid-row: span 2 / 5;
}

.e {
  grid-column-start: 1;
  grid-column-end: 3;
  grid-row-start: 1;
  grid-row-end: 4;
}

.warn {
  grid-column-end: 3;
  grid: subgrid;
  grid-gap: 1rem;
  grid-template-areas: "head head"
                       "nav  main"
                       "foot ....";
}

.no-warn {
  /* autoprefixer grid: off */
  grid-column-end: 3;
  grid: subgrid;
  grid-gap: 1rem;
  grid-template-areas: "head head"
                       "nav  main"
                       "foot ....";
}

.warn-gap-rows {
  grid-gap: 1rem;
  grid-template-rows: 1fr 1fr;
  grid-template-areas:
      "a a"
      "a a";
}

.warn-gap-rows {
  grid-column-gap: 1rem;
  grid-template-rows: 1fr 1fr;
  grid-template-areas:
      "b b"
      "b b";
}

.warn-gap-columns {
  grid-gap: 1rem;
  grid-template-columns: 1fr 1fr;
  grid-template-areas:
      "c c"
      "c c";
}

.warn-gap-columns {
  grid-row-gap: 1rem;
  grid-template-columns: 1fr 1fr;
  grid-template-areas:
      "d d"
      "d d";
}

.unknown {
  justify-self: start;
  align-self: start;
}

.flex {
  justify-self: flex-end;
  align-self: flex-end;
}

/* should add grid prefixes because a flex container can be a grid item */
.align-justify-grid-flex {
  display: flex;
  justify-self: start;
  align-self: end;
}

@supports (display: grid) {
  .foo {
    display: grid;
  }
}

@supports (justify-items: start) {
  .foo {
    justify-items: start;
  }
}

.warn {
  grid-column-span: 2;
  grid-row-span: 2;
  grid-auto-columns: 100px;
  grid-auto-rows: 100px;
  grid-auto-flow: column;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  grid-template-rows: repeat(auto-fit, minmax(400px, 1fr));
}

.baz {
  grid-column: span 3;
}

.bar {
  grid-row: span 3;
}

.warn-display-contents {
  display: grid;
}
/* Emit warning if grid enabled */
.warn-display-contents .grid {
  display: contents;
}

.warn_ie_align {
  align-items: center;
  display: grid;
}

.warn_ie_justify {
  justify-items: center;
  display: grid;
}

.warn_ie_justify_content {
  justify-content: center;
  display: grid;
}

.warn_place_items {
  place-items: start end;
  display: grid;
}

.place-self-a {
  place-self: center;
}

.place-self-b {
  place-self: start end;
}

/* must have correct -ms-grid-rows/columns values */
.grid-correct-rows-columns {
  display: grid;
  grid-template-columns: 50px repeat(2, 1fr 2fr) 50px;
  grid-template-rows: repeat(1, auto 100px);
  grid-gap: 20px;
  grid-template-areas:
    ". . . . . ."
    ". . . . . .";
}

.warn-auto-flow {
  grid-auto-flow: column;
  grid-template-columns: 1fr 1fr;
  grid-template-areas:
      ". ."
      ". .";
}

.center-wrapper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-areas:
    ". z z ."
    ". z z .";
}
.center-item {
  grid-area: z;
  align-self: center;
  justify-self: center;
}

.named {
  grid-template-rows: 1fr;
  grid-template-columns: [content] 1fr;
}