What are the best practices for handling style attributes in HTML Purifier to prevent potential vulnerabilities in PHP applications?

When using HTML Purifier in PHP applications, it is important to properly configure the allowed style attributes to prevent potential security vulnerabilities such as cross-site scripting (XSS) attacks. To do this, you should only allow specific safe CSS properties and values while filtering out potentially harmful ones. 

$config = HTMLPurifier_Config::createDefault();
$config->set('CSS.AllowedProperties', 'color, font-size, text-align');
$purifier = new HTMLPurifier($config);

$clean_html = $purifier->purify($dirty_html);

Keywords

HTML Purifier style attributes vulnerabilities PHP applications best practices

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