Bootstrap Snippet border corner using HTML CSS

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<!DOCTYPE html>
<html lang="en">
<head>
<title>HTML</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://fonts.googleapis.com/css?family=Roboto:400,500,700" rel="stylesheet">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<!--[if IE]> <link href="~/Content/NewHomePage/all-ie-only.css" rel="stylesheet" /> <![endif]-->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
   <!--
  This is a part of my blog post
  https://codepen.io/ThiemelJiri/post/3-css-border-in-corners-techniques
-->
<h1 class="sample-heading">
  <span class="heading">Sample heading</span>
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.sample-heading {
  padding: 1em;
  border: 0.25em solid;
  position: relative;
  &::before, &::after {
    content: '';
    display: block;
    position: absolute;
    background: #fff;
  }
  
  &::before {
    top: -0.3em; // let it overlap a bit to prevent thin line which could appear during scaling in some browsers etc.
    bottom: -0.3em;
    left: 1em;
    right: 1em;
  }
  
  &::after{
    left: -0.3em;
    right: -0.3em;
    top: 1em;
    bottom: 1em;
  }
  
  // you need this to move the text in front of the ::after overlay
  .heading {
    position: relative;
    z-index: 1;
  }
}
///////////////////////////
//   Presentation only   //
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"border corner"
Bootstrap 3.3.0 Snippet by imsachin

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"border corner" Bootstrap 3.3.0 Snippet by imsachin

Related: See More

Questions / Comments:

"border corner"
Bootstrap 3.3.0 Snippet by imsachin