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+<!DOCTYPE html>
+<html class="reftest-wait">
+<head>
+<meta charset="utf-8">
+<style>
+.v-lr { writing-mode:vertical-lr;  }
+.v-rl { writing-mode:vertical-rl; }
+
+div {
+  width: 300px;
+  height: 200px;
+  background: #ddd;
+  margin: 50px;
+  text-rendering: optimizeLegibility;
+}
+</style>
+
+<script>
+function doTest() {
+  document.getElementById("test").textContent =
+    "New text inserted by script, to cause a reflow that slides the following lines.";
+  document.documentElement.removeAttribute("class");
+}
+</script>
+
+</head>
+
+<body onload="doTest()">
+
+<div class="v-lr">
+First part of the block.
+<i id="test"></i>
+We will insert enough new content that it wraps onto additional lines.
+<br><br>
+Here is some more text that follows a forced break.
+Observe what happens to it when text is added earlier.
+</div>
+
+</body>
+</html>