comment ie weirdness

Author: cal-smith

src/dialog/dialog.component.ts

@@ -137,6 +137,9 @@ export class Dialog implements OnInit, AfterViewInit, OnDestroy {
 	 */
 	ngAfterViewInit() {
 		const dialogElement = this.dialog.nativeElement;
+		// split the wrapper class list and apply seperatly to avoid IE from
+		// 1. throwing an error due to asigning a readonly property (classList)
+		// 2. throwing an SyntaxError due to passing an empty string to .add
 		if (this.dialogConfig.wrapperClass) {
 			for (const extraClass of this.dialogConfig.wrapperClass.split(" ")) {
 				dialogElement.classList.add(extraClass);