What distinctions exist between setting width: auto; and width: fit-content;?

As far as my understanding goes, when you apply width: fit-content; to an element, it signifies that the element's width will expand to utilize all available space, but will not shrink below the min-content size within the element. However, does the default width: auto; behave in a similar manner?

I find myself pondering about the scenarios where I should opt for using width: fit-content;...

Answer №1

width: auto is the default width for all elements, so the width will depend on display types (block, inline, etc.) to display respectively.

To provide a clearer understanding of width:auto, I have included 2 code snippets below

Case 1: Utilizing div with display: block as the default setting

.container {
  border: 2px solid #ccc;
  padding: 10px;
  width: 20em;
}

.item {
  width: auto;
  background-color: lightblue;
  padding: 5px;
  margin-bottom: 1em;
}
<div class="container">
  <div class="item">Item</div>
  <div class="item">Item with more text in it.</div>
  <div class="item">Item with more text in it, hopefully it's lengthy enough for the demo</div>
</div>

Case 2: Utilizing span with display: inline as the default setting

.container {
  border: 2px solid #ccc;
  padding: 10px;
  width: 20em;
}

.item {
  width: auto;
  background-color: lightblue;
  padding: 5px;
  margin-bottom: 1em;
}
<div class="container">
  <span class="item">Item</span>
  <span class="item">Item with more text in it.</span>
  <span class="item">Item with more text in it, hopefully it's lengthy enough for the demo</span>
</div>

Essentially, display: block will occupy the full width for element display, while display: inline and display: inline-block will align with the content width. The question arises: why not use display: inline or display: inline-block instead of width: fit-content?

Let's observe the following code snippet for div with width: fit-content

.container {
  border: 2px solid #ccc;
  padding: 10px;
  width: 20em;
}

.item {
  width: fit-content;
  background-color: lightblue;
  padding: 5px;
  margin-bottom: 1em;
}
<div class="container">
  <div class="item">Item</div>
  <div class="item">Item with more text in it.</div>
  <div class="item">Item with more text in it, hopefully it's lengthy enough for the demo</div>
</div>

You may notice that each line of content is displayed within an individual colored box, without encroaching upon other lines' space

In response to your query

Just wondering when should I use width: fit-content;?

Based on my personal experience, I tend to employ width: fit-content; when aiming to display tags with fitting borders

https://i.sstatic.net/U7svk.png

Source

All my tags can be exhibited on separate lines, yet the borders will conform to the content, making width: fit-content a preferred option for me.

P/s: In fact, there are alternate methods to attain this design such as utilizing a wrapper, employing flexbox, etc. Nevertheless, I lean towards width: fit-content due to its simplicity. It is worth noting that this approach may not function optimally with Internet Explorer (refer to browser compatibility here)

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