When no border-color is specified, the border color is the value of the color property. : border style : Box Model HTML CSS TUTORIALS

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When no border-color is specified, the border color is the value of the color property.


 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en'>
    <head>
        <title>border</title>
        <style rel='stylesheet' type='text/css'>
div#color-default {
    color: crimson;
    border-style: solid dotted;
}
        
        </style>
    </head>
    <body>
        <div id='color-default'>
            Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
        </div>
    </body>
</html>