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-rw-r--r--layout/reftests/css-animations/background-position-running.html16
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diff --git a/layout/reftests/css-animations/background-position-running.html b/layout/reftests/css-animations/background-position-running.html
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+<!DOCTYPE html>
+<title>background-position-x animation while running</title>
+<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 */
+ background-position-x: 0px;
+ animation: holdBackgroundPosition 100s infinite;
+}
+</style>
+<div id="test" class="reftest-opaque-layer"></div>