Explication détaillée de l'attribut border du style CSS

<p></p>

 p {
    height: 20px;
    width: 20px;
    border-color: #FF9600 #3366ff #12ad2a #f0ed7a;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: #FF9600 #3366ff #12ad2a #f0ed7a;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: lightblue transparent trnasparent transparent;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: transparent trnasparent pink;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: transparent gray trnasparent transparent;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: transparent transparent trnasparent lightgreen;
    border-style: solid;
    border-width: 20px;
}