Is it necessary for nested Bootstrap 3 rows to be within a col-sm-* or can they also be nested within a col-md-, col-xs-, etc?
The documentation specifies col-sm-* but does not clearly state if nesting within other col sizes is not allowed.
Is it necessary for nested Bootstrap 3 rows to be within a col-sm-* or can they also be nested within a col-md-, col-xs-, etc?
The documentation specifies col-sm-* but does not clearly state if nesting within other col sizes is not allowed.
The col-sm-* example you mentioned is just for demonstration purposes. In reality, it should be col-*-* (xs, sm, md, lg).
If you scroll down a bit, you will see examples of pushing and pulling columns using .col-md-push-* and .col-md-pull-*. This is also just a representation, as any column can be pushed and pulled as needed.
Additionally, a nested row does not have to be directly inside the parent column. The key point to remember is that each row must be immediately followed by a column, but nested rows can be enclosed by any element.
For instance:
<div class="row">
<div class="col-xs-12">This is okay</div>
</div>
<div class="row">
<div class="foo">
<div class="col-xs-12">This is not okay</div>
</div>
</div>
<div class="row">
<div class="col-xs-12">
<div class="row">
<div class="col-xs-6">This is okay</div>
</div>
</div>
</div>
<div class="row">
<div class="col-xs-12">
<div class="foo">
<div class="row">
<div class="col-xs-6">This is okay</div>
</div>
</div>
</div>
</div>
Utilize multiple classes simultaneously and let Bootstrap determine the most suitable one for the screen.
You have the option to nest classes within different types based on your specific requirements.
The classes in TWBS3 like .col-xx-x only determine width based on percentages, for example, .col-sm-4 { width: 25% }, .col-md-4 { width: 25% }, and .col-md-4 { width: 25% }.
Although they all achieve the same result, you only need to specify one.
So why have multiple options? There are two main reasons:
These variants allow you to adjust column widths at different screen resolutions. For instance, .col-sm-4 .col-md-3 will display as 1/4 width on small screens and 1/3 width on medium, large, and extra-large screens.
Once the screen size decreases below the chosen width, the column will revert to its 'mobile first' variant. For example, .col-sm-4 will be 1/4 width on small, medium, large, and extra-large screens, but full width on extra small screens. Similarly, using only .col-md-4 will be 1/4 width on medium, large, and extra-large screens, but full width on small and extra small screens. This is why a class combination like .col-sm-4 .col-md-4 is unnecessary.
Therefore, in response to your question: No, you only require one declaration, but remember to choose the size carefully as the column will expand to full width (width: 100%) when the screen size is smaller.
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