grid-template-areas

grid-template-areas:
  "a a a"
  "b c c"
  "b c c";

grid-template-areas:
  "b b a"
  "b b c"
  "b b c";

grid-template-areas:
  "a a ."
  "a a ."
  ". b c";

<section class="default-example" id="default-example">
  <div class="example-container">
    <div class="transition-all" id="example-element">
      <div>One (a)</div>
      <div>Two (b)</div>
      <div>Three (c)</div>
    </div>
  </div>
</section>

#example-element {
  border: 1px solid #c5c5c5;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: repeat(3, minmax(40px, auto));
  grid-gap: 10px;
  width: 200px;
}

#example-element :nth-child(1) {
  background-color: rgb(0 0 255 / 0.2);
  border: 3px solid blue;
  grid-area: a;
}

#example-element :nth-child(2) {
  background-color: rgb(255 0 200 / 0.2);
  border: 3px solid rebeccapurple;
  grid-area: b;
}

#example-element :nth-child(3) {
  background-color: rgb(94 255 0 / 0.2);
  border: 3px solid green;
  grid-area: c;
}

/* Keyword value */
grid-template-areas: none;

/* <string> values */
grid-template-areas: "a b";
grid-template-areas:
  "a b ."
  "a c d";

/* Global values */
grid-template-areas: inherit;
grid-template-areas: initial;
grid-template-areas: revert;
grid-template-areas: revert-layer;
grid-template-areas: unset;

<div id="page">
  <header>Header</header>
  <nav>Navigation</nav>
  <main>Main area</main>
  <footer>Footer</footer>
</div>

#page {
  display: grid;
  width: 100%;
  height: 250px;
  grid-template-areas:
    "head head"
    "nav  main"
    ".  foot";
  grid-template-rows: 50px 1fr 30px;
  grid-template-columns: 150px 1fr;
}

#page > header {
  grid-area: head;
  background-color: #8ca0ff;
}

#page > nav {
  grid-area: nav;
  background-color: #ffa08c;
}

#page > main {
  grid-area: main;
  background-color: #ffff64;
}

#page > footer {
  grid-area: foot;
  background-color: #8cffa0;
}