grid-autoplacement.css

.grid-basic {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto;
  grid-gap: 30px;
}

/* Must work with repeat function */
.grid-repeat {
  display: grid;
  grid-template-columns: repeat(4, 1fr 2fr);
  grid-template-rows: repeat(2, auto);
  grid-gap: 30px;
}

/* Complex case */
.grid-complex {
  display: grid;
  grid-template-columns: 1fr repeat(2, minmax(100px, 200px)) 1fr;
  grid-template-rows: 100px repeat(2, auto);
  grid-gap: 30px 5px;
}

/* Must work inside media */
@media (min-width: 400px) {
  .grid-media {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: auto;
    grid-gap: 30px;
  }
}

/* Must consider autoflow value */
.grid-flow-column {
  display: grid;
  grid-auto-flow: column;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto auto;
  grid-gap: 30px;
}

/* Show warning if rows are not defined
   and dense value is used */
.grid-warning-dense {
  grid-auto-flow: column dense;
  grid-template-columns: 1fr 1fr 1fr;
}

/* Show warning autoflow used without rows/columns */
.grid-warning-autoflow {
  grid-auto-flow: column;
}

.grid-autoplace-disabled {
  /* autoprefixer grid: no-autoplace */
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto;
  grid-gap: 30px;
}

.grid-autoplace-gap-warn {
  grid-template-columns: 1fr 1fr 1fr;
  grid-gap: 30px;
}