feat(cdk/a11y): HighContrastModeDetector need not support IE11 (#24462)

Author: damingerdai

src/cdk/a11y/high-contrast-mode/high-contrast-mode-detector.ts

@@ -92,19 +92,18 @@ export class HighContrastModeDetector {
   _applyBodyHighContrastModeCssClasses(): void {
     if (!this._hasCheckedHighContrastMode && this._platform.isBrowser && this._document.body) {
       const bodyClasses = this._document.body.classList;
-      // IE11 doesn't support `classList` operations with multiple arguments
-      bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
-      bodyClasses.remove(BLACK_ON_WHITE_CSS_CLASS);
-      bodyClasses.remove(WHITE_ON_BLACK_CSS_CLASS);
+      bodyClasses.remove(
+        HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS,
+        BLACK_ON_WHITE_CSS_CLASS,
+        WHITE_ON_BLACK_CSS_CLASS,
+      );
       this._hasCheckedHighContrastMode = true;
 
       const mode = this.getHighContrastMode();
       if (mode === HighContrastMode.BLACK_ON_WHITE) {
-        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
-        bodyClasses.add(BLACK_ON_WHITE_CSS_CLASS);
+        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS);
       } else if (mode === HighContrastMode.WHITE_ON_BLACK) {
-        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
-        bodyClasses.add(WHITE_ON_BLACK_CSS_CLASS);
+        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);
       }
     }
   }