CSS Properties: How to define the shape of top-left corner?

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HTML Code:

<!DOCTYPE html>
<title>How to define the shape of top-left-radius-length corner</title>
<style type="text/css"> 
div {
border: 3px solid #FF0000;
padding: 10px 40px; 
background: #00CCCC;
width: 150px;
<h1>w3resource Tutorial</h1>
<div>The border-top-left-radius-length property allow to add rounded corners to elements.</div>

Live Demo:

See the Pen border-top-left-radius-length-answer by w3resource (@w3resource) on CodePen.

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