CSS Properties: How to set the width of the four borders?

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HTML Code:

<!DOCTYPE html>
<title>How to specify the width of the four border</title>
<style type="text/css"> 
h1.xyz{border-style: solid;
border-top-width: 1px;
h1.xyz1 {
border-style: solid;
border-width: medium;
h1.xyz2 {
border-style: solid;
border-width: 10px;
<p>w3resource Tutorial</p>
<h1 class="xyz">HTML5</h1>
<h1 class="xyz1">JavaScript</h1>
<h1 class="xyz2">PHP & others</h1>
<p><b>Note:</b> The border-width property does not work alone.</p>

Live Demo:

See the Pen border-width-answer by w3resource (@w3resource) on CodePen.

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