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+<!DOCTYPE html>
+<title>mask-size animation in delay phase</title>
+<style>
+@keyframes changeMaskSize {
+ from { mask-size: 50px 50px; }
+ to { mask-size: 50px 50px; }
+}
+
+#test {
+ height: 100px;
+ width: 100px;
+ mask-repeat: no-repeat;
+ mask-position: center center;
+ 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: changeMaskSize 100s 100s infinite;
+}
+
+#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>