In Firefox, the parent div's width is greater than the combined width of its children

In Firefox, I am encountering a peculiar problem.

The issue arises when I have a div with a height defined in a fixed px value, and an img element nested within it. While this configuration works fine in Chrome, in Firefox, the parent div's width ends up being larger than the img inside it.

Here is the HTML structure:

<div class="wrapper">
    <div class="imageHolder">
        <img src='dasource'>
    </div>
</div>

And here is the corresponding CSS:

.wrapper {
    width: 900px;
}

.imageHolder {
    height: 400px;
    width: auto;
    background-color: green;
    float: left;
    max-width: 50%;
    overflow: hidden;
}

.imageHolder img {
    height: 100%;
}

http://jsfiddle.net/MXudn/6

The provided fiddle demonstrates that in Firefox, the parent div ends up wider than the image it contains.

Do you have any insights into why this might be happening?

Answer №1

This appears to be a Firefox bug. It seems that using `overflow: hidden` causes the parent `div` to retain the width of the original image instead of adjusting to the scaled size.

Link to demonstration

<div class="imageHolder">
    <img src='http://placehold.it/650x650' />
<div>
.imageHolder {
    height: 400px;
    background-color: green;
    float: left;
    overflow: hidden;
}

.imageHolder img {
    height: 100%;
}

In this simplified example, the issue is clearly visible. The image starts as 650px wide, but when resized based on height, it becomes 400px wide. However, the parent container remains at 650px width.

If the `overflow: hidden` property is not required, simply removing it resolves the problem.

Updated demonstration

EDIT: Firefox bugzilla ticket addressing this issue.

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