How Does the `display` Property Affect Flexbox Item Layout?

Understanding the Display Property in Flexbox Items

In Flexbox, the display property controls the layout of child elements within a flex container. While flex items default to display: block, modifying this property can introduce interesting effects and functional benefits. Two common options are display:block and display:inline-block.

Key Considerations:

The CSS specification clarifies that setting display to inline-level values like display:inline-block will be computed to block-level values (in this case, block) when used as a child of a flex container. Therefore, there is no practical difference between display:block and display:inline-block in flexbox items.

However, setting display to table, inline-table, inline-grid, or grid can have significant effects. In these cases, the flex item will adopt the behavior of the specified display type.

Example:

Consider the following code:

.box {
  display: flex;
  margin:5px;
}

.box>div {
  height: 50px;
  width: 100%;
  background: red;
  display: grid;
  grid-template-columns: 200px 1fr;
  grid-template-rows: 1fr;
  grid-gap: 20px;
}

span {
  border: 2px solid green;
}

<div class="box">
  <div>
    <span></span>

    <span></span>
  </div>
</div>

<div class="box">
  <div>

In the first box, the display:grid property transforms the flex item into a grid, with two columns and one row. The spans inside the grid are aligned according to the grid layout.

In the second box, setting display:inline-grid results in an inline grid, where the spans are presented horizontally instead of vertically.

By manipulating the display property, you can harness the power of Flexbox and other display types to create flexible and complex layouts.

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