How Can I Reorder HTML Block Elements Using Only CSS?

CSS for Reordering Block Elements

Seeking a method to rearrange the order of HTML block elements solely through CSS can be a challenge. This question tackles this issue, aiming to switch the order of three blocks without compromising their display behavior as block elements.

The CSS Solution

The solution provided utilizes CSS flexbox. By setting the parent element to display:flex and flex-flow: column, the elements become stacked vertically. Then, using the order property, the order of the child elements can be customized. For example, #a {order:2;} would move the element with id="a" to the second position.

Implementation

To implement this solution, first set the parent element to display as a flex container:

#parent { display: flex; flex-flow: column; }

Next, use the order property to change the order of the child elements:

#a { order: 2; }
#b { order: 3; }
#c { order: 1; }

Media Query Considerations

To cater to different screen sizes, a media query can be used to control the layout. For instance, the following rule would switch the order of the blocks for screens with a maximum width of 300px:

@media screen and (max-width: 300px) {
  #parent {
    display: flex;
    flex-flow: column;
  }
  #a { order: 2; }
  #b { order: 3; }
  #c { order: 1; }
}

Example

Here is a simplified example that demonstrates the concept:

<div>

Adjust the browser window's width to observe how the order of the div elements changes.

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