Accessibility. Fix Microsoft/monaco-editor#506 , document role should have...

Accessibility. Fix Microsoft/monaco-editor#506 , document role should have title per w3c documentation.

src/vs/editor/standalone/browser/accessibilityHelp/accessibilityHelp.ts

@@ -299,6 +299,8 @@ class AccessibilityHelpWidget extends Widget implements IOverlayWidget {
 		text += '\n\n' + nls.localize("outroMsg", "You can dismiss this tooltip and return to the editor by pressing Escape or Shift+Escape.");
 
 		this._contentDomNode.domNode.appendChild(renderFormattedText(text));
+		// Per https://www.w3.org/TR/wai-aria/roles#document, Authors SHOULD provide a title or label for documents
+		this._contentDomNode.domNode.setAttribute('aria-label', text);
 	}
 
 	public hide(): void {

src/vs/workbench/parts/codeEditor/electron-browser/accessibility.ts

@@ -253,6 +253,8 @@ class AccessibilityHelpWidget extends Widget implements IOverlayWidget {
 		text += '\n\n' + nls.localize('outroMsg', "You can dismiss this tooltip and return to the editor by pressing Escape or Shift+Escape.");
 
 		this._contentDomNode.domNode.appendChild(renderFormattedText(text));
+		// Per https://www.w3.org/TR/wai-aria/roles#document, Authors SHOULD provide a title or label for documents
+		this._contentDomNode.domNode.setAttribute('aria-label', text);
 	}
 
 	public hide(): void {