CSS Properties: How to specify the double top border?

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HTML Code:

<!DOCTYPE html>
<title>How to specify the double top border</title>
<style type="text/css"> 
h1 {border-style: solid;
border-width: 10px;
h1.abc {border-top-style:double;
border-top-color: #22CF64;
<h1 class="abc">Double top border style</h1>

Live Demo:

See the Pen border-top-style-double-answer by w3resource (@w3resource) on CodePen.

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