Exploring Tailwind’s latest CSS Grid functionality, I've come across the use of Grid Column with values like span 1/span 1 for the class col-span-1, span 2/ span 2 for col-span-2, and up to span 12/span 12 for col-span-12.
Yet, I find myself puzzled when it comes to understanding the concept behind span 1/ span 1. While 1 / span 1 makes sense to me, as does span 1/ 3, I struggle to grasp the meaning behind span 1/ span 1.
The explanation provided in response to your question does not fully clarify the underlying concept. Temani Afif pointed out that 'span 1 / span 1 is essentially equal to span 1' in the comments, which is accurate but does not delve into the rationale behind Tailwind's code structure, a crucial aspect that your inquiry seems to address.
Let's examine the scenario with span 2 / span 2 for instance. This signifies the value assigned to the grid-column property, serving as a shorthand for both grid-column-start and grid-column-end properties. It can also be represented as follows:
grid-column-start: span 2;
grid-column-end: span 2;
According to the 'Grid Placement Conflict Handling' segment of the specifications:
In scenarios where the placement involves two spans, one contributed by the end grid-placement property is eliminated.
Therefore, when analyzed independently, such code translates to:
grid-column-start: span 2;
This setup functions adequately if the starting line for the grid item remains unspecified. However, suppose you wish to commence the item from the third line... You could set grid-column-start to 3, yet this action overrides the preceding value of span 2. What you truly aim to express is:
grid-column-start: 3;
grid-column-end: span 2;
A similar case applies if positioning the item from the right edge of the grid is required. In such instances, you might specify:
grid-column-start: span 2;
grid-column-end: -3;
Given that a utility framework like Tailwind lacks insight into your exact positional intent, it pre-defines both options at the onset:
grid-column: span 2 / span 2;
Consequently, you retain the flexibility to override either property with an integer (depicting position) or maintain its default setting, disregarding the value of grid-column-end.
While pondering over the question, I was experimenting with this CodePen and stumbled upon a solution.
<div class="grid grid-cols-3 gap-3 bg-gray-300">
<div class="bg-green-500 text-white text-6xl flex items-center justify-center border-8 border-black col-span-1">1</div>
<div class="bg-indigo-500 text-white text-6xl flex items-center justify-center border-8 border-black">2</div>
<div class="bg-red-500 text-white text-6xl flex items-center justify-center border-8 border-black">3</div>
<div class="bg-yellow-500 text-white text-6xl flex items-center justify-center border-8 border-black">4</div>
</div>
If you have Tailwind CSS linked, the above HTML will display the output shown in this link.
Observe the use of col-span-1 in element 1. The code col-span-1 signifies span 1 / span 1.
Now, let’s modify the code as follows:
<div class="grid grid-cols-3 gap-3 bg-gray-300">
<div class="bg-green-500 text-white text-6xl flex items-center justify-center border-8 border-black col-span-2">1</div>
<div class="bg-indigo-500 text-white text-6xl flex items-center justify-center border-8 border-black">2</div>
<div class="bg-red-500 text-white text-6xl flex items-center justify-center border-8 border-black">3</div>
<div class="bg-yellow-500 text-white text-6xl flex items-center justify-center border-8 border-black">4</div>
</div>
The element 1 now contains col-span-2, indicating span 2 / span 2. This change makes it cover the space reserved for element 2 as well.
The resulting output is displayed in this image.
If we were to use col-span-4 in element 1, it would not work due to the predefined column layout set by the parent div with grid-cols-3. Keep in mind that the span property covers space starting from its position within the grid.
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