Chrome extension override - javascript

I have a chrome extension that I found online. I am trying to put a link to my website in the override file but I am unsure how to do it. If anyone would know how it would be greatly appreciated.
<!DOCTYPE html>
<html>
<head>
<title>Cape Breton's Homepage</title>
</head>
<body>
script/code would go here
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<title>Cape Breton's Homepage</title>
</head>
<body>
Your Website
</body>
</html>

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I'm the one who started JavaScript yesterday.
I made code like this.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
</head>
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<script>
alert('Hello world \nNice to meet you \n');
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However, after the code was finished, it was inconvenient to only leave blank pages.
Is there a function in JavaScript that kills the running browser tab?
I use Windows as the operating system and Chrome as the browser.
========
'Window.close();' in the last line of code I added it, but nothing happened.
<!DOCTYPE html>
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Refer this stackoverflow question to get an idea why window.close() doesn't work for you.
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I'm working on a website in HTML5 CSS3 but I can't make my processing sketch work on other browsers than firefox.
Here is my code:
<!DOCTYPE html>
<html>
<head>
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d3.js doesn't work for some reason

I'm trying to understand d3 via this tutorial
So, I've downloaded script, named it d3.js and put it in the same directory with index.html
Here is code of index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3 Test</title>
<script type="text/javascript" src="d3.js"></script>
<style type="text/css"></style>
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<script type="text/javascript">
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<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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}//]]>
</script>
</head><body></body></html>
You can keep your script tag at the bottom of the body though.

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<head>
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<body>
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</html>
If you are opening the file locally in IE, you will a find confirmation message from IE saying
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Click on it and your code will run.

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