How can the use of JavaScript and CSS impact the display of HTML emails in various webmail providers?

The use of JavaScript and CSS in HTML emails can impact the display in various webmail providers because these providers often strip out or disable these elements for security reasons. To ensure consistent display across different email clients, it's best to avoid using JavaScript and CSS in HTML emails and instead use inline styling and table layouts. 

// Example PHP code snippet for sending HTML email with inline styling and table layout
$to = "recipient@example.com";
$subject = "Example HTML Email";
$message = "
<html>
<head>
<style>
table {
  border-collapse: collapse;
}
td {
  border: 1px solid black;
  padding: 5px;
}
</style>
</head>
<body>
<h1>Hello, World!</h1>
<table>
<tr>
<td>Cell 1</td>
<td>Cell 2</td>
</tr>
</table>
</body>
</html>
";

$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";

mail($to, $subject, $message, $headers);

Keywords

JavaScript CSS HTML emails webmail providers display impact

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