CSS Properties: How to set the width of the left border?

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HTML Code:

<!DOCTYPE html><!-- Declaration of HTML5 document type -->
<title>How to set the width of the left border</title><!-- Title of the HTML document -->
<style type="text/css">
/* CSS styling */
h1  {
border-style: solid; /* Sets the border style for h1 elements to solid */
border-left-width: 10px; /* Sets the width of the left border for h1 elements to 10 pixels */
<p>w3resource Tutorial</p><!-- Paragraph content -->
<h1>border left width</h1><!-- h1 element with a left border of specified width -->
<p><b>Note:</b> The "border-left-width" property does not work if it is used alone.</p><!-- Note regarding usage of "border-left-width" property -->


  • This HTML document demonstrates how to set the width of the left border for an h1 element.
  • The h1 elements have a common style with a solid border, and the width of the left border is set to 10 pixels.
  • A note is provided to indicate that the border-left-width property may not have an effect if used alone, as other border properties such as border-left-style and border-left-color are often required for a complete border definition.

Live Demo:

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

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