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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+
+ <head>
+
+  <title>CSS Writing Modes Test: positioning of an orthogonal (horizontal-tb) block alongside vertical-rl floats</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
+  <link rel="bookmark" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1283721" title="Bug 1283721: Incorrect positioning of orthogonal (horizontal-tb) block alongside vertical-rl floats" />
+  <link rel="help" href="http://www.w3.org/TR/css-writing-modes-3/#vertical-layout" title="7.1 Principles of Layout in Vertical Writing Modes" />
+  <link rel="match" href="ortho-htb-alongside-vrl-floats-010-ref.xht" />
+
+  <!--
+  The 'horizontal-tb' equivalent of this test is
+  http://www.gtalbot.org/BugzillaSection/Bug1283721-new-block-form-ctxt-alongside-floats-004.html
+  -->
+
+  <meta content="image" name="flags" />
+  <meta content="This test checks that non-positioned block boxes created after the float box flow vertically as if the float did not exist. In this test, the orange block box, which creates a new block formatting context, should flow next to the earliest float that offers sufficient (logical width) space: in this test, this is the blue rectangle." name="assert" />
+  <meta name="DC.date.created" content="2016-07-04T09:54:03+11:00" scheme="W3CDTF" />
+  <meta name="DC.date.modified" content="2016-07-21T09:54:03+11:00" scheme="W3CDTF" />
+
+  <style type="text/css"><![CDATA[
+  html
+    {
+      writing-mode: vertical-rl;
+    }
+
+  div
+    {
+      width: 100px;
+    }
+
+  div#first-blue-float
+    {
+      background-color: blue;
+      clear: left;
+      float: left;
+      height: 25%;
+    }
+
+  div#second-olive-float-with-clear
+    {
+      background-color: olive;
+      clear: left;
+      float: left;
+      height: 50%;
+    }
+
+  div#third-fuchsia-float-with-clear
+    {
+      background-color: fuchsia;
+      clear: left;
+      float: left;
+      height: 75%;
+    }
+
+  div#orange-horiz-tb
+    {
+      background-color: orange;
+      height: 50%;
+      writing-mode: horizontal-tb;
+    }
+  ]]></style>
+
+ </head>
+
+ <body>
+
+  <p><img src="support/ortho-htb-alongside-vrl-floats-002-exp-res.png" width="300" height="36" alt="Image download support must be enabled" /></p>
+
+  <!--
+  The image says:
+  Test passes if the orange rectangle
+  is below the blue rectangle.
+  -->
+
+  <div id="first-blue-float">&nbsp;</div>
+
+  <div id="second-olive-float-with-clear">&nbsp;</div>
+
+  <div id="third-fuchsia-float-with-clear">&nbsp;</div>
+
+  <div id="orange-horiz-tb">&nbsp;</div>
+
+ </body>
+</html>