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+<!DOCTYPE html>
+<title>Reference of testcases for bug 1279403</title>
+<style>
+span {
+  height: 100px;
+  width: 100px;
+  background: green;
+  position: fixed;
+  top: 50px;
+}
+div {
+  height: 100px;
+  width: 100px;
+  background: blue;
+}
+#first {
+}
+#second {
+  position: fixed;
+}
+</style>
+<span></span>
+<div id="first"></div>
+<div id="second"></div>