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A web widget is a web page or web application that is embedded as an element of a host web page but which is substantially independent of the host page, having limited or no interaction with the host. A web widget commonly provides users of the host page access to resources from another web site, content that the host page may be prevented from accessing itself by the browser's same-origin policy or the content provider's CORS policy. That content includes advertising (Google's AdSense), sponsored external links (Taboola), user comments (Disqus), social media buttons (Twitter, Facebook), news (USA Today), and weather (AccuWeather). Some web widgets though serve as user-selectable customizations of the host page itself (Elfsight, Powr, OpenWidget).
^Brad at CD Baby (August 28, 2012). "Website Widgets: What Are They and Why Do I Need Them?". The HostBaby Blog. Widgets: They're those little doo-dads you see on websites, often in the sidekbar, 0 perform one simple function and don't take up much room while they're doing it.
^"Widgets - Taboola Publisher Help Center". taboola.com.
^"Web Integration". disqus.com.
^"How to add the Tweet button to your website". twitter.com.