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+<!DOCTYPE HTML>
+<html class="reftest-wait">
+<head>
+ <meta charset="utf-8">
+ <title>Testcase for bug 1082098, smooth scrolling expected after dynamically setting scroll-behavior on body</title>
+ <style type="text/css">
+
+ html,body {
+ color: black;
+ background-color: white;
+ font-size: 16px;
+ padding: 0;
+ margin: 0;
+ }
+
+ #a_box {
+ position: relative;
+ left: 10px;
+ top: 10px;
+ width: 20px;
+ height: 20px;
+ background: blue;
+ }
+
+ #another_box {
+ position: relative;
+ left: 2000px;
+ top: 2000px;
+ width: 20px;
+ height: 20px;
+ background: green;
+ }
+
+ </style>
+</head>
+<body>
+ <div id="a_box"></div>
+ <div id="another_box"></div>
+<script>
+ function doTest() {
+ if (document.location.search != '?ref') {
+ // Scroll - expected to be smooth
+ window.scrollTo({left: 500, top: 500});
+ // Interrupt smooth scrolling
+ window.scrollTo({left: window.scrollX, top: window.scrollY});
+ // If scroll was not performed smoothly, we would be at 500,500 now
+ }
+ document.documentElement.removeAttribute("class");
+ }
+ window.scrollTo({left: 0, top: 0, behavior: "instant"});
+ document.documentElement.style.scrollBehavior = "smooth";
+ window.addEventListener("MozReftestInvalidate", doTest);
+</script>
+</body>
+</html>