What could be the reason for an element with a width of 100% not recognizing the width of its parent?

One issue I'm currently experiencing is my inability to match the width of the parent within a flexbox item.

Below is the code snippet, where the span element does not have the same width as its parent.

.container {
  display: flex;
}
.item1 {
  flex: 1 1 200px;
  border: 5px solid yellow;
}
.item2 {
  flex: 1 1 200px;
  border: 5px solid blue;
}
.item3 {
  flex: 1 1 200px;
  border: 5px solid red;
}
.theSpan {
  width: 100%;
  border: 2px solid black;
}
<div class='container'>
  <div class='item1'>
    <span class='theSpan'>abcdefg</span>
  </div>
  <div class='item2'>
    <span>1</span>
  </div>
  <div class='item3'>
    <span>2</span>
  </div>
</div>

Answer №1

Your span element with the class theSpan is nested within a flex item (.item1).

However, this flex item is not acting as a flex container.

Since only the children of a flex container are involved in flex layout, the span (which is a grandchild) is not eligible. It does not exist within a flex formatting context.

Instead, the span is situated within a standard block formatting context.

Within a BFC, a span is typically considered an inline, non-replaced element by default.

The reason why setting width: 100% does not take effect is explained in the specification:

10.2 Content width: the width property

This property does not affect non-replaced inline elements. The content width of a non-replaced inline element's boxes is determined by the rendered content within them.

10.3.1 Inline, non-replaced elements

The width property does not have an impact in this case.

Answer №2

To transform the span element into a block element, you can utilize the CSS property display.

.container {
  display: flex;
}
.item1 {
  flex: 1 1 200px;
  border: 5px solid yellow;
}
.item2 {
  flex: 1 1 200px;
  border: 5px solid blue;
}
.item3 {
  flex: 1 1 200px;
  border: 5px solid red;
}
.theSpan {
  display:block;/* Use display property instead of width */
  border: 2px solid black;
}
<div class='container'>
  <div class='item1'>
    <span class='theSpan'>abcdefg</span>
  </div>
  <div class='item2'>
    <span>1</span>
  </div>
  <div class='item3'>
    <span>2</span>
  </div>
</div>

Answer №3

To achieve the desired layout, make sure to set .item1 as display:flex and then specify the .theSpan with flex:1. Additionally, all items should be set with flex:0 200px to ensure a flex-basis of 200px without the need for flex:1.

.container {
  display: flex;
}
.container > div {
  flex: 0 200px
}
.item1 {
  display: flex;
  border: 5px solid yellow;
}
.item2 {
  border: 5px solid blue;
}
.item3 {
  border: 5px solid red;
}
.theSpan {
  flex: 1;
  border: 2px solid black;
}
<div class='container'>
  <div class='item1'>
    <span class='theSpan'>abcdefg</span>
  </div>
  <div class='item2'>
    <span>1</span>
  </div>
  <div class='item3'>
    <span>2</span>
  </div>
</div>

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