autoprefixer/test/cases/grid-template-areas.css

.a {
  grid-template-areas:
      "head head"
      "nav  main"
      "nav  foot"
      "another";
}

@media (max-width: 1000px) {
  .a {
    grid-template-areas: "head main";
  }
}

.b {
  grid-area: head;
}

.c {
  grid-area: main;
}

.d {
  grid-area: nav;
}

.e {
  grid-area: foot;
}

/****************\
  CONFLICT TESTS
\****************/

.grid {
  display: grid;
  grid-template-areas:
    "a-conflict a-conflict"
    "b-conflict b-conflict";
}

.grid.conflict {
  display: grid;
  grid-template-areas:
    "a-conflict"
    "b-conflict";
}

.a {
  grid-area: a-conflict;
}

.b {
  grid-area: b-conflict;
}

/****************\
  MQ CONFLICT TEST
\****************/
.grid-mq {
  display: grid;
  grid-template-areas: "a-mq b-mq";
}

@media (max-width: 600px) {
  .grid-mq {
    grid-template-areas:
      "a-mq"
      "b-mq";
  }
}

.grid.conflict {
  display: grid;
  grid-template-areas:
    "a-mq"
    "b-mq";
}

@media (min-width: 601px) {
  .grid.conflict {
    grid-template-areas: "a-mq b-mq";
  }
}

.a {
  grid-area: a-mq;
}

.b {
  grid-area: b-mq;
}

/*************************\
  OVERRIDE CONFLICT TESTS
\*************************/

.grid-overide {
  display: grid;
  grid-template-areas: "overide";
}

.grid-overide > .cell {
  grid-area: overide;
}

.grid-overide .cell {
  grid-area: overide;
}

.grand-parent .mother {
  display: grid;
  grid-template-areas: "child";
}
.grand-parent .father {
  display: grid;
  grid-template-areas: "child child";
}
.grand-parent .father-second {
  display: grid;
  grid-template-areas: "child-unique";
}
@media (min-width: 600px) {
  .grand-parent .father-second {
    grid-template-areas: "child-unique child-unique";
  }
}
.grand-parent .mother .cell {
  grid-area: child;
}
.grand-parent .mother > .cell {
  grid-area: child;
}

.grand-parent .father .cell {
  grid-area: child;
}
.grand-parent .father > .cell {
  grid-area: child;
}

/* emit warning */
.uncle .cell {
  grid-area: child;
}

/* emit warning */
.uncle > .cell {
  grid-area: child;
}

/* emit warning */
.grand-parent .uncle-second .cell {
  grid-area: child;
}

/* emit warning */
.grand-parent .uncle-second > .cell {
  grid-area: child;
}

/* emit warning */
.grand-parent .father.uncle .cell {
  grid-area: child;
}

/* emit warning */
.grand-parent.uncle .father > .cell {
  grid-area: child;
}

/* must not emit warning */
.uncle .cell {
  grid-area: child-unique;
}

/* must not emit warning */
.uncle > .cell {
  grid-area: child-unique;
}
/*************************\
  MULTI SELECTOR TEST
\*************************/

.grand-parent .uncle,
.grand-parent .aunt {
  display: grid;
  grid-template-areas: "cousin";
}
.grand-parent .uncle .cousin {
  grid-area: cousin;
}
.grand-parent .uncle > .cousin {
  grid-area: cousin;
}
.grand-parent .aunt .cousin {
  grid-area: cousin;
}
.grand-parent .aunt > .cousin {
  grid-area: cousin;
}

/*************************\
  CONTROL COMMENTS TEST
\*************************/

/* must not add prefixes */
.uncle .cell {
  /* autoprefixer: off */
  grid-area: child;
}

/* must not add prefixes */
.uncle .cell {
  /* autoprefixer: ignore next */
  grid-area: child;
}

.grid-example {
  display: grid;
}

@media (max-width: 767.98px) {
  .grid-example {
    grid-template-areas:
      'first first'
      'second third';
  }
}

.grid-area-first {
  grid-area: first;
}
  
.grid-area-second {
  grid-area: second;
}

.grid-area-third {
  grid-area: third;
}