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<!DOCTYPE html>
<title>Reference of testcases for background-position-x animations</title>
<style>
#test {
height: 100px;
width: 100px;
background-repeat: no-repeat;
background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAZCAMAAADzN3VRAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAAZQTFRF/wAAAAAAQaMSAwAAABJJREFUeNpiYBgFo2AwAIAAAwACigABtnCV2AAAAABJRU5ErkJggg==); /* a 25x25 px red box */
background-position-x: 50%;
}
</style>
<div id="test"></div>