Exemple de code de la propriété CSS grid-column-start.

<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-start-auto .cible{
  grid-column-start : auto; 
}
.grid-column-start-nombre .c1{ 
 grid-column-start : 2; 
}

.grid-column-start-nombre .c2{ 
 grid-column-start : -2; 
}

.grid-column-start-span .c1{ 
  grid-column-start : span 2; 
}
.grid-column-start-span .c2{ 
  grid-column-start : span 3; 
}

.grid-column-start-identifiant .c1{ 
  grid-column-start : C; 
}
.grid-column-start-identifiant .c2{ 
  grid-column-start : C -1; 
}

.grid-column-start-span-identifiant .c1{ 
  grid-column-start : span B; 
}
.grid-column-start-span-identifiant .c2{ 
  grid-column-start : 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-start-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-start-auto : auto; </strong> 
<div class="exemple exemple-grid-container grid-column-start-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">Cel. cible</div> 
</div>

<strong>grid-column-start: Numérique; </strong> 
<div class="exemple exemple-grid-container grid-column-start-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">Cible 1</div> 
  <div class="exemple-grid-item cible c2">Cible 2</div>
</div>

<strong>grid-column-start: Identifiant; </strong> 
<div class="exemple exemple-grid-container grid-column-start-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">Cible 1</div> 
  <div class="exemple-grid-item cible c2">Cible 2</div>
</div>

<strong>grid-column-start: span Numérique; </strong> 
<div class="exemple exemple-grid-container grid-column-start-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">Cible 1</div> 
  <div class="exemple-grid-item cible c2">Cible 2</div>
</div>
 
<strong> grid-column-start : span identifiant</strong> 
<div class="exemple exemple-grid-container grid-column-start-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">Cible 1</div> 
  <div class="exemple-grid-item cible c2">Cible 2</div>
</div>