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window.length Property in Window Object of Javascript Syntax with Examples
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Usage 
The length property is used to find number of iframe in current window.
Syntax 
window.length;
Syntax
<iframe src="http://www.knowledgewalls.com"></iframe>
<iframe src="http://tools.knowledgewalls.com"></iframe>
var x = window.length;
document.write("<br>Page contains no of iframes: "+x);
Output 
Page contains no of iframes: 2
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