[CSS Regions] Layout Test for selecting text ignoring region content

LayoutTests/fast/regions/resources/region-style.css

 .redBox {
     width: 50px;
     height: 50px;
     background-color: red;
 }
 
 .greenBox {
     width: 50px;
     height: 50px;
     background-color: green;
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     height: 300px;
     width: 100px;
 }
 
 .greyBigBoxVertical {
     height: 300px;
     width: 100px;
     background-color: lightgrey;
 }
 
+.float {
+    float: left;
+}
+
+.clear {
+    clear: both;
+}
+
 /* regions create Stacking Contexts */
 .forcedStackingContext {
     position: relative;
     z-index: 1;
 }