By J. D. BIERSDORFER

Q. In the column about fake security alerts that won’t go away, that was good advice for Windows and Mac users, but what about iPad users? There are no Option, Command or Escape keys on an iPad.

A. If an aggressive pop-up alert or ad invades your iPad, iPhone or iPod Touch screen, you have a few ways to get rid of the intrusive window. In the iOS version of Safari, try closing the browser tab by tapping the pages icon in the toolbar. When the thumbnail images of the open pages appear, tap the “x” in the top corner of the page to close that tab. You can also press and hold the Done button in the corner of the window until a menu pops up inviting you to close all the open tabs.

As another approach, try leaving. If you can get to the browser’s address bar, tap into it, type in a new URL and jump to another website.

Some pop-ups may be tenacious. As with desktop programs, you can force-quit iOS apps if the ad or scareware alert will not go away. To do that, double-click the home button. The iOS device should then display small versions of your open app windows on screen. If the web browser is not the first one in the stack, swipe through the thumbnails until it is in the center of the screen. When the browser is front and center, swipe up on the screen until its preview thumbnail disappears.

Clearing the Safari browser’s history can wipe out lurking URLs that may take you back to the problematic site with the pop-ups. Note that clearing history also removes website cookies and other data, so you may have to re-enter passwords for some sites. To clear your Safari history, go to the home screen, open the Settings icon, select Safari and tap “Clear History and Website Data.”

The Safari settings also include a Block Pop-Ups control you can enable. In iOS 9 and later, you can also install third-party content blockers from Apple’s App Store to filter out invasive elements.