Implement annotation layer regression testing

test/annotation_layer_test.css

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+/* Copyright 2015 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Used for annotation layer tests */
+
+.annotationLayer {
+  position: absolute;
+  left: 0;
+  top: 0;
+  right: 0;
+  bottom: 0;
+}
+
+.annotationLayer > section {
+  position: absolute;
+}
+
+.annotationLayer .annotLink > a {
+  position: absolute;
+  font-size: 1em;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  opacity: 0.2;
+  background: #ff0;
+  box-shadow: 0px 2px 10px #ff0;
+}
+
+.annotationLayer .annotText > img {
+  position: absolute;
+}
+
+.annotationLayer .annotTextContentWrapper {
+  position: absolute;
+  width: 20em;
+}
+
+.annotationLayer .annotTextContent {
+  z-index: 200;
+  float: left;
+  max-width: 20em;
+  background-color: #FFFF99;
+  box-shadow: 0px 2px 5px #333;
+  border-radius: 2px;
+  padding: 0.6em;
+  display: block !important;
+  font: message-box;
+}
+
+.annotationLayer .annotTextContent > h1 {
+  font-size: 1em;
+  border-bottom: 1px solid #000000;
+  margin: 0;
+  padding: 0 0 0.2em 0;
+}
+
+.annotationLayer .annotTextContent > p {
+  margin: 0;
+  padding: 0.2em 0 0 0;
+}