>
.wrapper {
  grid-template-areas: "a b" "a c";
}
.grid {
  display: grid;
  grid-template-areas: inherit;
  width: 100px;
  height: 100px;
  background: red;
}
.item {
  background: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="wrapper">
  <div class="grid">
    <div class="item" style="grid-area: a"></div>
    <div class="item" style="grid-area: b"></div>
    <div class="item" style="grid-area: c"></div>
  </div>
</div>
