Merge pull request #21158 from Mugen87/dev51

Examples: Clean up.

examples/webgl_animation_skinning_additive_blending.html

@@ -9,12 +9,6 @@
 			a {
 				color: blue;
 			}
-			.ac {  /* prevent dat-gui from being selected */
-				-webkit-user-select: none;
-				-moz-user-select: none;
-				-ms-user-select: none;
-				user-select: none;
-			}
 			.control-inactive {
 				color: #888;
 			}

examples/webgl_animation_skinning_blending.html

@@ -9,12 +9,6 @@
 			a {
 				color: #f00;
 			}
-			.ac {  /* prevent dat-gui from being selected */
-				-webkit-user-select: none;
-				-moz-user-select: none;
-				-ms-user-select: none;
-				user-select: none;
-			}
 			.no-pointer-events {
 				pointer-events: none;
 			}