Example input
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
padding: 5px;
}
table {
border-spacing: 15px;
}
</style>
</head>
<body>
<h2>Border Spacing</h2>
<p>Border spacing specifies the space between the cells.</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>
<p><strong>Tip:</strong> Try to change the border-spacing to 5px.</p>
</body>
</html>
Example output
1. Readability: To improve the readability of the HTML code, we could add comments for each section of the code. For example, we could add a comment for the style section as follows:
<!-- Start HTML code snippet -->
<!DOCTYPE html>
<html>
<head>
<!-- Style for table -->
<style>
table, th, td {
border: 1px solid black;
padding: 5px;
}
table {
border-spacing: 15px;
}
</style>
</head>
<body>
<!-- End HTML code snippet -->
2. Performance: To improve the performance of the HTML code, we could try to reduce the amount of data being transferred. This could be done by minifying the HTML code, removing redundant whitespaces, using shorter class and id names, avoiding inline CSS, and using image compression.
3. Security: To improve the security of the HTML code, we could use the X-XSS-Protection header to mitigate the risk of cross-site scripting attacks. This can be done by adding the following code to the `<head>` of the HTML document:
<!-- Start HTML code snippet -->
<head>
<meta http-equiv="X-XSS-Protection" content="1; mode=block" />
...
</head>
<!-- End HTML code snippet -->
4. Additional Suggestions: As an additional suggestion, we could use semantic HTML elements to improve the structure of the HTML code. For example, we could use the `<thead>`, `<tbody>`, and `<tfoot>` elements to divide the table into three sections. The code may look like this:
<!-- Start HTML code snippet -->
<table style="width:100%">
<thead>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
</tr>
</thead>
<tbody>
<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>
</tbody>
</table>
<!-- End HTML code snippet -->