[#350] Added Adactio article on PE

Author: Erik Isaksen

src/documents/articles/extensible-web-components.html.md

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+---
+title: Extensible Web Components
+authors: [jeremy_keith]
+date: 2016-08-03
+original_date: 2016-08-03
+link: https://adactio.com/journal/11052
+category: articles
+layout: single
+tags: ['Progressive Enhancement']
+---
+
+Using JavaScript with ShadowDOM, templates, and the other specs that together make up the web components ecosystem, you turn that inert span-like element into something all-singing and dancing. That’s great if the browser supports those technologies, and the JavaScript executes successfully. But if either of those conditions aren’t met, what you’re left with is basically a span.
+
+<!-- Excerpt -->