When using flex-wrap: wrap along with a transition on flex-basis, you might encounter issues with the transition not working as expected. This behavior is due to the way flex-wrap interacts with the transition property.

The flex-wrap property changes the wrapping behavior of flex items when they don't fit in a single line. When flex-wrap is set to wrap, the flex items will wrap to the next line if there isn't enough space in the current line.

The problem arises with the transition property because it's trying to animate a change in flex-basis when the flex items wrap. When a flex item wraps, its flex container adjusts its layout immediately, without any intermediate states to animate the flex-basis change smoothly. This lack of intermediate states prevents the transition from being smooth and makes it appear as if the transition is not working.

To overcome this issue and achieve a smooth transition on flex-basis when using flex-wrap: wrap, you can try the following workaround:

  1. Using CSS Transitions: Instead of relying solely on flex-basis for transitions, you can add a wrapper element around each flex item and apply the transition to the wrapper element's width. By doing this, you create a consistent element size, and when the flex item wraps, its width transitions smoothly.

Here's an example of how you can implement this workaround:


<div class="flex-container"> <div class="flex-item"> <div class="wrapper"> <!-- Add a wrapper element --> Content here </div> </div> <!-- Add more flex items as needed --> </div>


.flex-container { display: flex; flex-wrap: wrap; } .flex-item { /* Any other flex properties you want */ width: 200px; /* Set an initial width for the flex item */ } .wrapper { transition: width 0.5s; /* Apply the transition to the wrapper element's width */ } /* Hover styles to demonstrate the transition effect */ .wrapper:hover { width: 300px; /* Set the new width on hover or any other event */ }

With this approach, the transition will work smoothly even when flex-wrap: wrap is applied to the flex container.

Keep in mind that this workaround may add some complexity to your markup and CSS, but it allows you to achieve the desired transition effect on flex-basis without issues related to flex-wrap.

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