JavaScript Window property: top
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The top property (of the JavaScript
BOM window object) returns
the topmost browser window.
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head></head>
<body>
Window top: <b id="element1"></b><br>
top outerWidth: <b id="element2"></b><br>
<script>
var x = window.top;
document.getElementById("element1").innerHTML = x;
document.getElementById("element2").innerHTML = x.outerWidth;
</script>
</body>
</html>
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