Expose screen reader and navigation mode on demo/API

src/AccessibilityManager.ts

@@ -47,6 +47,8 @@ export class AccessibilityManager implements IDisposable {
     this._accessibilityTreeRoot.appendChild(this._rowContainer);
 
     this._renderRowsDebouncer = new RenderDebouncer(this._terminal, this._renderRows.bind(this));
+    this._refreshRows();
+
     this._navigationMode = new NavigationMode(this._terminal, this._rowContainer, this._rowElements, this);
 
     this._liveRegion = document.createElement('div');
@@ -92,6 +94,10 @@ export class AccessibilityManager implements IDisposable {
     return this._navigationMode.isActive;
   }
 
+  public enterNavigationMode(): void {
+    this._navigationMode.enter();
+  }
+
   private _onResize(cols: number, rows: number): void {
     // Grow rows as required
     for (let i = this._rowContainer.children.length; i < this._terminal.rows; i++) {

src/Terminal.ts

@@ -1334,6 +1334,12 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     }
   }
 
+  public enterNavigationMode(): void {
+    if (this._accessibilityManager) {
+      this._accessibilityManager.enterNavigationMode();
+    }
+  }
+
   /**
    * Gets whether the terminal has an active selection.
    */