Exemple de code de la propriété CSS grid-column.

<style>
.exemple-grid-container{ 
  display : grid; 
  grid-template-columns : [A] auto [B] auto [C] auto [A] auto [R] auto [C-star] auto [A] auto [B] auto [C] auto ; 
  grid-template-rows : auto auto; 
}

.grid-column-auto .cible{
  grid-column : auto / auto; 
}

.grid-column-nombre .c1{ 
  grid-column : 1 / 3; 
}

.grid-column-nombre .c2{ 
  grid-column : R / -3; 
}

.grid-column-span .c1{ 
  grid-column : 1 / span 2; 
}

.grid-column-span .c2{ 
  grid-column : A 2 / span 3; 
}

.grid-column-identifiant .c1{ 
  grid-column : 2 / B; 
}

.grid-column-identifiant .c2{ 
  grid-column : R / C -1; 
}

.grid-column-span-identifiant .c1{ 
  grid-column : 1 / span B; 
}

.grid-column-span-identifiant .c2{  
  grid-column : R / span R; 
}


.exemple-grid-item{border:1px dotted #666; }
.exemple-grid-item.cible{border-color:#008A11; background-color:mediumaquamarine; }
.exemple { border:1px solid #2a712a; margin-bottom:10px; padding:5px; }
</style>
<strong>sans grid-column-auto </strong> 
<div class="exemple exemple-grid-container">
  <div class="exemple-grid-item">Cel. 1 A</div>
  <div class="exemple-grid-item">Cel. 2 B</div>
  <div class="exemple-grid-item">Cel. 3 C</div>
  <div class="exemple-grid-item">Cel. 4A</div>  
  <div class="exemple-grid-item">Cel. 5R</div>
  <div class="exemple-grid-item">Cel. 6C-start</div>
  <div class="exemple-grid-item">Cel. 7A</div>
  <div class="exemple-grid-item">Cel. 8B</div> 
  <div class="exemple-grid-item">Cel. 9C</div> 
  <div class="exemple-grid-item cible">Cel. cible</div> 
</div>

<strong>grid-column-auto : auto; </strong> 
<div class="exemple exemple-grid-container grid-column-auto">
 <div class="exemple-grid-item">Cel. 1 A</div>
  <div class="exemple-grid-item">Cel. 2 B</div>
  <div class="exemple-grid-item">Cel. 3 C</div>
  <div class="exemple-grid-item">Cel. 4A</div>  
  <div class="exemple-grid-item">Cel. 5R</div>
  <div class="exemple-grid-item">Cel. 6C-start</div>
  <div class="exemple-grid-item">Cel. 7A</div>
  <div class="exemple-grid-item">Cel. 8B</div> 
  <div class="exemple-grid-item">Cel. 9C</div> 
  <div class="exemple-grid-item cible">grid-column : auto / auto</div> 
</div>

<strong>grid-column: numérique; </strong> 
<div class="exemple exemple-grid-container grid-column-nombre">
   <div class="exemple-grid-item">Cel. 1 A</div>
  <div class="exemple-grid-item">Cel. 2 B</div>
  <div class="exemple-grid-item">Cel. 3 C</div>
  <div class="exemple-grid-item">Cel. 4A</div>  
  <div class="exemple-grid-item">Cel. 5R</div>
  <div class="exemple-grid-item">Cel. 6C-start</div>
  <div class="exemple-grid-item">Cel. 7A</div>
  <div class="exemple-grid-item">Cel. 8B</div> 
  <div class="exemple-grid-item">Cel. 9C</div> 
  <div class="exemple-grid-item cible c1">grid-column : 1 / 3</div> 
  <div class="exemple-grid-item cible c2">grid-column : R / -3</div>
</div>

<strong>grid-column: identifiant; </strong> 
<div class="exemple exemple-grid-container grid-column-identifiant">
   <div class="exemple-grid-item">Cel. 1 A</div>
  <div class="exemple-grid-item">Cel. 2 B</div>
  <div class="exemple-grid-item">Cel. 3 C</div>
  <div class="exemple-grid-item">Cel. 4A</div>  
  <div class="exemple-grid-item">Cel. 5R</div>
  <div class="exemple-grid-item">Cel. 6C-start</div>
  <div class="exemple-grid-item">Cel. 7A</div>
  <div class="exemple-grid-item">Cel. 8B</div> 
  <div class="exemple-grid-item">Cel. 9C</div> 
  <div class="exemple-grid-item cible c1">grid-column : 2 / B</div> 
  <div class="exemple-grid-item cible c2">grid-column : R / C -1</div>
</div>

<strong>grid-column: span numérique; </strong> 
<div class="exemple exemple-grid-container grid-column-span"> 
   <div class="exemple-grid-item">Cel. 1 A</div>
  <div class="exemple-grid-item">Cel. 2 B</div>
  <div class="exemple-grid-item">Cel. 3 C</div>
  <div class="exemple-grid-item">Cel. 4A</div>  
  <div class="exemple-grid-item">Cel. 5R</div>
  <div class="exemple-grid-item">Cel. 6C-start</div>
  <div class="exemple-grid-item">Cel. 7A</div>
  <div class="exemple-grid-item">Cel. 8B</div> 
  <div class="exemple-grid-item">Cel. 9C</div> 
  <div class="exemple-grid-item cible c1">grid-column : 1 / span 2</div> 
  <div class="exemple-grid-item cible c2">grid-column : A 2 / span 3</div>
</div>
 
<strong> grid-column : span identifiant</strong> 
<div class="exemple exemple-grid-container grid-column-span-identifiant"> 
   <div class="exemple-grid-item">Cel. 1 A</div>
  <div class="exemple-grid-item">Cel. 2 B</div>
  <div class="exemple-grid-item">Cel. 3 C</div>
  <div class="exemple-grid-item">Cel. 4A</div>  
  <div class="exemple-grid-item">Cel. 5R</div>
  <div class="exemple-grid-item">Cel. 6C-start</div>
  <div class="exemple-grid-item">Cel. 7A</div>
  <div class="exemple-grid-item">Cel. 8B</div> 
  <div class="exemple-grid-item">Cel. 9C</div> 
  <div class="exemple-grid-item cible c1"> grid-column : 1 / span B</div> 
  <div class="exemple-grid-item cible c2">grid-column : R / C -1</div>
</div>