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+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Position Test: sticky element with left offset specified with percentage unit</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+  <link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos">
+  <link rel="match" href="reference/position-sticky-left-002-ref.html">
+
+  <meta name="flags" content="">
+
+  <style>
+  div.scrolling-container
+    {
+      background-image: url("support/100x100-red.png");
+      background-repeat: no-repeat;
+      height: 150px;
+      margin-bottom: 30px;
+      overflow-y: hidden;
+      position: static;
+      white-space: nowrap;
+      width: 250px;
+    }
+
+  div#first-scrolling-container
+    {
+      background-position: right top;
+    }
+
+  div#second-scrolling-container
+    {
+      background-position: 100px top;
+    }
+
+  div#third-scrolling-container
+    {
+      background-position: 50px top;
+    }
+
+  div.horizontal-spacer
+    {
+      display: inline-block;
+      height: 100%;
+      width: 100px;
+    }
+
+  div.content
+    {
+      display: inline-block;
+      height: 100%;
+      width: 300px;
+    }
+
+  div.sticky
+    {
+      background-color: green;
+      display: inline-block;
+      height: 100px;
+      left: 40%;
+      position: sticky;
+      vertical-align: top;
+      width: 100px;
+    }
+  </style>
+
+  <body onload="document.getElementById(&quot;first-scrolling-container&quot;).scrollLeft = 50; document.getElementById(&quot;second-scrolling-container&quot;).scrollLeft = 150; document.getElementById(&quot;third-scrolling-container&quot;).scrollLeft = 300;">
+
+  <p>Test passes if there are 3 filled green squares and <strong>no red</strong>.
+
+  <!--
+  first-scrolling-container: before reaching the sticking point
+  -->
+
+  <div id="first-scrolling-container" class="scrolling-container">
+
+    <div class="horizontal-spacer"></div><div class="content"><div class="horizontal-spacer"></div><div id="first-sticky" class="sticky"></div><div class="horizontal-spacer"></div></div><div class="horizontal-spacer"></div>
+
+  </div>
+
+  <!--
+  second-scrolling-container: when reaching the sticking point and beyond
+  -->
+
+  <div id="second-scrolling-container" class="scrolling-container">
+
+    <div class="horizontal-spacer"></div><div class="content"><div class="horizontal-spacer"></div><div id="second-sticky" class="sticky"></div><div class="horizontal-spacer"></div></div><div class="horizontal-spacer"></div>
+
+  </div>
+
+
+  <div id="third-scrolling-container" class="scrolling-container">
+
+    <div class="horizontal-spacer"></div><div class="content"><div class="horizontal-spacer"></div><div id="third-sticky" class="sticky"></div><div class="horizontal-spacer"></div></div><div class="horizontal-spacer"></div>
+
+  </div>