Hit test SVG line boxes

third_party/WebKit/LayoutTests/svg/hittest/text-with-multiple-tspans.svg

+<svg onload="runTest()" xmlns="http://www.w3.org/2000/svg" width="300" height="150" viewBox="0 0 300 150">
+    <rect id="background" width="100%" height="100%" fill="blue" />
+    <text id="text">
+        <tspan id="tspan1" x="10" dy="1em">Foo</tspan>
+        <tspan id="tspan2" x="10" dy="1.2em">Foo bar baz</tspan>
+    </text>
+    <defs>
+        <style type="text/css">
+        <![CDATA[
+            @font-face {
+                font-family: Ahem;
+                src: url(../../resources/Ahem.ttf);
+            }
+            text {
+                font-family: Ahem;
+                font-size: 40px;
+            }
+        ]]>
+        </style>
+        <script type="text/javascript">
+        <![CDATA[
+            function runTest() {
+                if (window.testRunner)
+                    testRunner.dumpAsText();
+
+                // The point at 170,30 is contained within the text's bounding box
+                // but not in a painted part so the element should be the background.
+                // The point 50,30 is contained within the first tspan's bounding box.
+                // 50,60 and 250,60 are both contained within the second tspan's bounding box.
+                var text = document.getElementById("text");
+                var tspan1 = document.getElementById("tspan1");
+                var tspan2 = document.getElementById("tspan2");
+                var background = document.getElementById("background");
+                if (document.elementFromPoint(50, 30) === tspan1
+                        && document.elementFromPoint(170, 30) === background
+                        && document.elementFromPoint(50, 60) === tspan2
+                        && document.elementFromPoint(250, 60) === tspan2)
+                    text.textContent = "PASS";
+                else
+                    text.textContent = "FAIL";
+            }
+        ]]>
+        </script>
+    </defs>
+</svg>