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Home/ Questions/Q 1094973
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Editorial Team
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Editorial Team
Asked: May 17, 20262026-05-17T00:03:05+00:00 2026-05-17T00:03:05+00:00

I have a window in Xul, and I want to put a background image

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I have a window in Xul, and I want to put a background image on it.

I found nothing about the z-order, and the background-image and z-index in css is not working for the window.. any idea?

In the following test, the image is showing, but not as background. The image starts after the last caption.

My xul file:

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<?xml-stylesheet href="chrome://greenfox/content/tv.css" type="text/css"?>

<window id="mywindow" title="Test" width="640" height="480" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

        <caption label="secondary window"/>
        <caption label="secondary window"/>
        <caption label="secondary window"/>
        <caption label="secondary window"/>
        <caption label="secondary window"/>
        <caption label="secondary window"/>
        <caption label="secondary window"/>
        <caption label="secondary window"/>

        <image class="Wallpaper" src="images/plasma.jpg"/>

</window>

My CSS:

.Wallpapaer {
    position:absolute;
    z-index: -1;
}
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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-17T00:03:06+00:00Added an answer on May 17, 2026 at 12:03 am

    (an hour later) Found! Need to add all in a box component, and add background to the box class in css..

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