JavaScript window.top Property

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JavaScript window.top Property

The window.top property returns a reference to the topmost window in the window hierarchy.

Note: This property is read-only.

Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <button onclick="myFunction()">Check this window</button> <p id="point"></p> <script> var x = document.getElementById("point"); function myFunction() { if(window.top != window.self) x.innerHTML = "This window is not the first frame in this page"; else x.innerHTML = "This window is the first frame in this page"; } </script> </body> </html>

Syntax

window.top

Return Value

ValueExplanation
ObjectReturns a reference to the topmost window in the window hierarchy.

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