.a { grid-area: 5 / 1 / span 1 / span 5;}
.b { grid-area: span 1 / span 3 / 4 / 4;}
.c { grid-area: 2 / 2;}
.d { grid-area: "custom-ident";}
.e { grid-area: 2 / 2 / 3 / 8;}
.f { grid-area: 2 / 2 / 3;}
/* emit warning */.g { grid-area: 3 / 1; grid-row: 1; grid-column: 2;}
.h { grid-area: 3 / 1; grid-column: 1 / span 4;}
/* there should be no warning */.i { grid-area: 3 / 1; grid-column-end: span 4;}
.j { grid-area: 3 / 1; grid-row-end: span 4;}