Determining the widths of elements when floated in Opera 11.*

I'm currently facing an issue with the Opera 11.5 beta (although I suspect this applies to all Opera 11 versions) where a floated block-level element (an unordered list) is being assigned a random fixed width, causing the child elements to wrap - similar to how IE6 behaves.

The element in question is floated to the right and has no sibling elements at the moment. There are no specific widths defined for lists in my stylesheet.

I am curious about the logic that Opera employs to calculate the width under these circumstances.

I have included an image comparing Opera 11.5 to Firefox 4.1 along with Dragonfly/Firebug output.

jsFiddle: http://jsfiddle.net/i_like_robots/HKAQ9/

csslayoutoperacss-float

Answer №1

In my opinion, there seems to be a bug present in Opera.

During the calculation of an element's width, it takes into account the total width of all child elements. However, if you have 2 Div elements as children displayed as block elements, the actual width is not the sum of both elements.

To resolve this issue, simply specify the width of the parent element instead of relying on Opera for calculations.

@clairesuzy - You can witness the bug by running the provided code here:

Answer №2

I am not sure of the reason yet (I will investigate later)

However, Opera seems to have an issue with the replace class not having a specified width

.replace {
    display:block;
    overflow:hidden;
    text-indent:-9999px;
    background: no-repeat 0 0;
    width: 10px;
}

It seems like the purpose of this class is to contain a replacement background image, so it should be acceptable to include a width for it?

Update: The issue is related to the use of the text-indent property for hiding text - removing the text indent resolves the problem in Opera as well

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