JavaScript Reference
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Quick Reference

The Window closed property returns “true” if the specified window is closed.

<!-- html element to place output -->
<p id="my_output"></p>
// variables
let my_window;
let my_result = '';

// window
if (my_window.closed) {
    my_result = 'The window is closed.';
}
else {
    my_result = 'The window is open.';
}

// place time on the page
function my_greeting() {
    document.getElementById('my_output').innerHTML = my_result;
}

Output

The window is closed.

Syntax

window.closed

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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