diff --git a/src/test/html/test_slam_layout.css b/src/test/html/test_slam_layout.css
new file mode 100644
index 00000000000..fed7aa97a3a
--- /dev/null
+++ b/src/test/html/test_slam_layout.css
@@ -0,0 +1,10 @@
+#ohhi {
+ background-color: red;
+ padding: 6px;
+}
+
+#mark {
+ background-color: blue;
+ padding: 12px;
+}
+
diff --git a/src/test/html/test_slam_layout.html b/src/test/html/test_slam_layout.html
new file mode 100644
index 00000000000..55adc8109b0
--- /dev/null
+++ b/src/test/html/test_slam_layout.html
@@ -0,0 +1,7 @@
+
+
+
+
+
+
+
diff --git a/src/test/html/test_slam_layout.js b/src/test/html/test_slam_layout.js
new file mode 100644
index 00000000000..5d1726b904e
--- /dev/null
+++ b/src/test/html/test_slam_layout.js
@@ -0,0 +1,14 @@
+var divs = document.getElementsByTagName("div");
+var div = divs[0];
+
+var count = 1000;
+var start = new Date();
+for (var i = 0; i < count; i++) {
+ if (i % 2 == 0)
+ div.setAttribute('id', 'ohhi');
+ else
+ div.setAttribute('id', 'mark');
+ div.getBoundingClientRect();
+}
+var stop = new Date();
+window.alert((stop - start) / count * 1e6 + " ns/layout");