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
Value | Explanation |
---|---|
Object | Returns a reference to the topmost window in the window hierarchy. |
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