mozilla-central/layout/reftests/bugs/1466638-1.html

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Test Info:

<!DOCTYPE html>
<html>
<style>
@keyframes holdBackgroundPosition {
from,to { background-position-x: 50%; }
}
#test {
height: 100px;
width: 100px;
background-repeat: no-repeat;
background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAZCAMAAADzN3VRAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAAZQTFRF/wAAAAAAQaMSAwAAABJJREFUeNpiYBgFo2AwAIAAAwACigABtnCV2AAAAABJRU5ErkJggg==); /* a 25x25 px red box */
animation: holdBackgroundPosition 100s infinite;
}
#wrapper {
filter: opacity(0.5);
}
</style>
<div id="wrapper">
<div id="test"></div>
</div>