Added several more HTML5 samples

src/site/samples/imagefilters/example/imagefilters.css

Index: src/site/samples/imagefilters/example/imagefilters.css
diff --git a/src/site/samples/imagefilters/example/imagefilters.css b/src/site/samples/imagefilters/example/imagefilters.css
new file mode 100644
index 0000000000000000000000000000000000000000..8102b83cb26ebb6544493a105530cebbe71b1931
--- /dev/null
+++ b/src/site/samples/imagefilters/example/imagefilters.css
@@ -0,0 +1,38 @@
+/*
+  Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+  for details. All rights reserved. Use of this source code is governed by a
+  BSD-style license that can be found in the COPYING file.
+*/
+
+body {
+  background-color: #F8F8F8;
+  font-family: 'Open Sans', sans-serif;
+  font-size: 14px;
+  font-weight: normal;
+  line-height: 1.2em;
+  margin: 15px;
+}
+
+p {
+  color: #333;
+}
+
+figure {
+  width: 700px;
+  margin: 50px auto;
+  padding-left: 50px;
+}
+
+#container {
+  width: 100%;
+  border: 1px solid #ccc;
+  background-color: #fff;
+}
+
+.show {
+  display: inline;
+}
+
+.hide {
+  display: none;
+}