DOMPurify/demos/hooks-target-blank-demo.html

<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8" />
        <title>DOMPurify demo: Hook to open all links in a new window</title>
        <script src="../dist/purify.js"></script>
    </head>
    <body>
        <!-- Our DIV to receive content -->
        <div id="sanitized"></div>

        <!-- Now let's sanitize that content -->
        <script>
            'use strict';

            // Specify dirty HTML
            const dirty = `
                <a href="?a">CLICK</a>
                <a href="?a" target="jajaja">CLICK</a>
                <svg><a href="?svg"><circle r=40></a></svg>
                <form action="?form"><input type="submit"></form>
                <img src="404" width="200" height="200" usemap="#test">
                <map name="test"><area href="?area" shape="rect" coords="0,0,200,200"></area></map>
                <math href="?mathml">CLICKME</math>
                <math><mi href="?mathml">CLICKME</mi></math>
                <math><mi target="xxx" href="?mathml">CLICKME</mi></math>
                <svg xmlns:xlink="http://www.w3.org/2000/svg"><a xlink:href="?bla"><circle r=40></a></svg>
            `;
            
            // Add a hook to make all links open a new window
            DOMPurify.addHook('afterSanitizeAttributes', (node) => {
                if ('target' in node) {
                    node.setAttribute('target', '_blank');
                    node.setAttribute('rel', 'noopener noreferrer');
                }
                if (!node.hasAttribute('target') && (node.hasAttribute('xlink:href') || node.hasAttribute('href'))) {
                    node.setAttribute('xlink:show', 'new');
                }
            });
            
            // Clean HTML string and write into our DIV
            const clean = DOMPurify.sanitize(dirty);
            document.getElementById('sanitized').innerHTML = clean;
        </script>
    </body>
</html>