This is an experimental technologyCheck the Browser compatibility table carefully before using this in production. The FocusEvent.relatedTarget read-only property represents a secondary target for this event, which will depend on the event itself. In some cases (like when tabbing in or out of a page), this property may be set to null for security reasons. Syntax secondTarget = focusEvent.relatedTarget Specifications Specification Status Comment Document Object Model (DOM) Level 3 Events SpecificationThe definition of 'FocusEvent.relatedTarget' in that specification. Obsolete Initial definition. Browser compatibility The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. Desktop Mobile FeatureChromeEdgeFirefoxInternet ExplorerOperaSafariBasic support Yes Yes489 Yes YesFeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung InternetBasic support Yes Yes Yes48 Yes Yes ?DesktopMobileChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetBasic support ExperimentalChrome Full support YesEdge Full support YesFirefox Full support 48IE Full support 9Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 48Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android ? Legend Full support Full support Compatibility unknown Compatibility unknownExperimental. Expect behavior to change in the future.Experimental. Expect behavior to change in the future. See also The FocusEvent interface it belongs to.