CSS Properties: How to specify a thick left border?

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HTML Code:

<!DOCTYPE html>
<title>How to specify a thick left border</title>
<style type="text/css"> 
h1  {
    border-style: solid;
    border-left-width: thick;
<p>w3resource Tutorial</p>
<h1>border left width thick</h1>

Live Demo:

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

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