Comparing flex-fill and flex-grow-1 in Bootstrap: Understanding the distinctions

Can you explain to me what sets apart the flex-fill and flex-grow-1 classes in Bootstrap 4+?


According to the documentation, flex-fill is defined as:

Fill

When applied to sibling elements, the .flex-fill class ensures that they occupy widths equal to their content, utilizing all available horizontal space.

Is the use of flex-fill limited to multiple sibling elements only?


On the other hand, flex-grow is described as:

Grow and shrink

By using .flex-grow-* utilities, you can control a flex item's ability to expand and fill available space.


In the provided code snippet, both flex-grow-1 and flex-fill appear to have a similar function of expanding elements to occupy any available space:

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9efcf1f1eaedeaecffeedeabb0afb0ae">[email protected]</a>/dist/js/bootstrap.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a2c0cdcdd6d1d6d0c3d2e2978c938c92">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet"/>

<div class="container border border-primary m-4 p-4">
    <h3>Default</h3>
    <div class="d-flex">
        <p class="border border-dark">This is some sample text.</p>
        <p><span class="badge bg-danger rounded-pill">1000</p>
    </div>
    <h3>With <code>.flex-fill</code></h3>
    <div class="d-flex">
        <p class="flex-fill border border-dark">This is some sample text.</p>
        <p><span class="badge bg-danger rounded-pill">1000</p>
    </div>
    <h3>With <code>.flex-grow-1</code></h3>
    <div class="d-flex">
        <p class="flex-grow-1 border border-dark">This is some sample text.</p>
        <p><span class="badge bg-danger rounded-pill">1000</p>
    </div>
</div>

Do you think flex-fill and flex-grow-1 are always interchangeable? Or are there specific scenarios where one is more suitable than the other?

Answer №1

flex-grow-1 solely applies flex-grow:1 and does not affect flex-basis or flex-shrink.

On the other hand, flex-fill sets...

flex-grow: 1;
flex-shrink: 1;
flex-basis: auto;

Alternatively, it can be expressed as:

flex: 1 1 auto;

Essentially, flex: 1 1 auto; and flex-grow: 1 are equivalent. This is due to the default behavior of flexbox. Hence, flex-fill and flex-grow-1 can be used interchangeably.

Nevertheless, Bootstrap introduced distinct classes for "grow" and "shrink" to enable their contradictory application within the same flex parent. Moreover, the other "grow" and "shrink" classes can toggle between 1 and 0, while flex-fill is exclusively for flex-grow: 1.

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