Khi cần hiệu chỉnh đường viền của bảng, bạn nên dùng style
Dùng style để hiệu chỉnh bảng
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
}
</style>
</head>
<body><h2>Table With Border</h2>
<p>Use the CSS border property to add a border to the table.</p>
<table style="width:100%">
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
</tr>
<tr>
<td>Jill</td>
<td>Smith</td>
<td>50</td>
</tr>
<tr>
<td>Eve</td>
<td>Jackson</td>
<td>94</td>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
<td>80</td>
</tr>
</table></body>
</html>
Thu hẹp đường viền của bảng
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
border-collapse: collapse;
}
</style>
</head>
<body><h2>Collapsed Borders</h2>
<p>If you want the borders to collapse into one border, add the CSS border-collapse property.</p><table style="width:100%">
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
</tr>
<tr>
<td>Jill</td>
<td>Smith</td>
<td>50</td>
</tr>
<tr>
<td>Eve</td>
<td>Jackson</td>
<td>94</td>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
<td>80</td>
</tr>
</table></body>
</html>
Tạo phong cách cho bảng
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid white;
border-collapse: collapse;
}
th, td {
background-color: #96D4D4;
}
</style>
</head>
<body><h2>Table With Invisible Borders</h2>
<p>Style the table with white borders and a background color of the cells to make the impression of invisible borders.</p>
<table style="width:100%">
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
</tr>
<tr>
<td>Jill</td>
<td>Smith</td>
<td>50</td>
</tr>
<tr>
<td>Eve</td>
<td>Jackson</td>
<td>94</td>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
<td>80</td>
</tr>
</table></body>
</html>
Bo tròn góc các ô trong bảng
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
border-radius: 10px;
}
</style>
</head>
<body><h2>Table With Rounded Borders</h2>
<p>Use the CSS border-radius property to add rounded corners to the borders.</p>
<table style="width:100%">
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
</tr>
<tr>
<td>Jill</td>
<td>Smith</td>
<td>50</td>
</tr>
<tr>
<td>Eve</td>
<td>Jackson</td>
<td>94</td>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
<td>80</td>
</tr>
</table></body>
</html>
Thay đổi kiểu đường viền của bảng
Các kiểu đường viền (border-style) có thể dùng:
dotted
dashed
solid
double
groove
ridge
inset
outset
none
hidden
<!DOCTYPE html>
<html>
<head>
<style>
th, td {
border-style: dotted;
}
</style>
</head>
<body>
<h2>Table With Dotted Borders</h2>
<p>Use the CSS border-style property to set the style of the borders.</p>
<table style="width:100%">
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
</tr>
<tr>
<td>Jill</td>
<td>Smith</td>
<td>50</td>
</tr>
<tr>
<td>Eve</td>
<td>Jackson</td>
<td>94</td>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
<td>80</td>
</tr>
</table>
</body>
</html>
https://tritue.edu.vn/tuecode/tracnghiem30/index.php/baiviet/post/view/id/200?id=200