How to prevent a user from clicking links on a page / only allow the browser to navigate to whitelisted URLs?

3D WebView doesn't yet have an API specifically for this, but I have a feature request for it, and I'll update this article if I add support for it in the future. In the meantime, here are some options:

1. One option is to add JavaScript to IWebView.PageLoadScripts that disables links to sites that aren't whitelisted, like this:

await webViewPrefab.WaitUntilInitialized();
webViewPrefab.WebView.PageLoadScripts.Add(@"
    const whitelistedDomains = [
        'developer.vuplex.com',
        'google.com'
    ];

    // Every 500ms, check for links to non-whitelisted domains.
    setInterval(() => {
        const anchorTags = Array.from(document.getElementsByTagName('a'));
        for (const anchorTag of anchorTags) {
            const url = anchorTag.getAttribute('href');
            if (shouldDisableLink(url)) {
                anchorTag.removeAttribute('href');
            }
        }
    }, 500);

    function shouldDisableLink(url) {
        if (!url) {
            return false;
        }
        if (url.indexOf('http') !== 0) {
            return false;
        }
        for (const domain of whitelistedDomains) {
            if (url.indexOf(`http://${domain}`) === 0 || url.indexOf(`https://${domain}`) === 0) {
                return false;
            }
        }
        return true;
    }
");

2. Even with disabling links like shown in option #1, a page can still navigate to a different URL via JavaScript. So, I also recommend attaching a handler to IWebView.UrlChanged that detects if the webview navigated to a site that isn't whitelisted and, if so, either use IWebView.LoadUrl() to navigate to the last acceptable site or use IWebView.GoBack() to go back.