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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } /* ==============(colgroup)============== */ colgroup { display: table-column-group; } /* ==============(colgroup)============== */ </style> </head> <body> <h1>CSS Default Value For <kbd>(colgroup)</kbd></h1> <div class="content"> <p>By default, "colgroup" element is displayed like this:</p> <table> <colgroup> <col span="2" style="background-color:violet"> <col style="background-color:yellow"> </colgroup> <tr> <th>ISBN</th> <th>Title</th> <th>Price</th> </tr> <tr> <td>3476896</td> <td>My first HTML</td> <td>$53</td> </tr> <tr> <td>5869207</td> <td>My first CSS</td> <td>$49</td> </tr> </table> <h2>Default CSS Properties</h2> <pre class="default"> colgroup { display: table-column-group; } </pre> </div> <!--============= End =============--> <script> var h=document.querySelector("h1");h.style.padding="30px",h.style.background="#333",h.style.color="#fff",h.style.boxShadow="0 0 3px 0 #aaa",h.style.borderTopLeftRadius="5px",h.style.borderTopRightRadius="5px";var k=document.querySelectorAll("h1 kbd");k.forEach(function(e){e.style.color="#0f0"});var c=document.querySelector(".content");c.style.cssText="background:#f8f9fa;box-shadow:0 0 3px 0 #aaa;border-bottom-left-radius:5px;border-bottom-right-radius:5px;padding:20px 30px;margin-top:-22px";var p=document.querySelector(".default");p.style.cssText="background:#fefefe;box-shadow:inset 0 0 3px 0 #aaa;border-left:5px solid #333;padding:10px"; </script> </body> </html>