Fixed webgl_materials_blending.

examples/webgl_materials_blending.html

@@ -101,6 +101,7 @@
 						const material = new THREE.MeshBasicMaterial( { map: map } );
 						material.transparent = true;
 						material.blending = blending.constant;
+						material.premultipliedAlpha = true;
 
 						const x = ( i - blendings.length / 2 ) * 110;
 						const z = 0;