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+<!DOCTYPE html>
+<title>mask-position animation in delay phase</title>
+<style>
+ @keyframes holdMaskPosition {
+ from,to { mask-position: left top; }
+ }
+ #test {
+ height: 100px;
+ width: 100px;
+ mask-repeat: no-repeat;
+ mask-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="25" height="25"><rect x="0" y="0" width="25" height="25" fill="blue"/></svg>');
+ animation: holdMaskPosition 100s 100s infinite;
+ mask-position: center center;
+ }
+
+ #inner {
+ height: 100px;
+ width: 100px;
+ background-color: blue;
+ box-sizing: border-box;
+ /* Apply will-change property to force paint mask on mask layer */
+ border: 1px solid transparent;
+ will-change: transform;
+ }
+</style>
+<div id="test"><div id="inner"></div></div>