divtools checker

Testen ob devtools ( Browserkonsole ) geöffnet ist
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Der hier verwendete Code

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="description" content="Detect if DevTools is open">
<meta name="author" content="Sindre Sorhus">
<meta name="viewport" content="width=device-width">
<title>devtools-detect • Detect if DevTools is open</title>
<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css">
<style>
* {
padding: 0;
margin: 0;
}
.main h1 {
font-size: 60px;
font-weight: 100;
}
#devtools-state {
margin: 50px 0 36px 0;
font-size: 100px;
font-weight: 200;
}
#devtools-orientation {
margin-bottom: 40px;
font-size: 28px;
height: 28px;
font-weight: 100;
}
.instruction {
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