W3Schools Tryit Editor

<!DOCTYPE html>
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<head>
<style>

#borderimg1 { 
  border: 15px solid transparent;
  padding: 15px;
  border-image-source: url(border.png);
  border-image-repeat: stretch;  
  border-image-slice: 30;
}

#borderimg2 { 
  border: 15px solid transparent;
  padding: 15px;
  border-image-source: url(border.png);
  border-image-repeat: repeat;
  border-image-slice: 30;
}

#borderimg3 { 
  border: 15px solid transparent;
  padding: 15px;
  border-image-source: url(border.png);
  border-image-repeat: round;
  border-image-slice: 30;
}

#borderimg4 { 
  border: 15px solid transparent;
  padding: 15px;
  border-image-source: url(border.png);
  border-image-repeat: space;
  border-image-slice: 30;
}
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<h1>The border-image-repeat Property</h1>
<p>The border-image-repeat property specifies whether the border image should be repeated, rounded, spaced or stretched:</p>

<h2>border-image-repeat: stretch (default):</h2>
<p id="borderimg1">Here, the image is stretched to fill the area.</p>

<h2>border-image-repeat: repeat:</h2>
<p id="borderimg2">Here, the image is tiled to fill the area. Tiles are divided if necessary.</p>

<h2>border-image-repeat: round:</h2>
<p id="borderimg3">Here, the image is tiled to fill the area. The image is rescaled if necessary, to avoid dividing tiles.</p>

<h2>border-image-repeat: space:</h2>
<p id="borderimg4">Here, the image is tiled to fill the area. Extra space is distributed around the tiles if necessary.</p>

<p>Here is the original image:</p>
<img src="border.png">

<p><strong>Note:</strong> Internet Explorer 10, and earlier versions, do not support the border-image-repeat property.</p>

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