This is not true.<p>All of the browsers are on board to ship Web Components and have been actively engaged in the standards discussions.<p>Safari just shipped Shadow DOM v1 in Safari Technology Preview. <a href="https:&#x2F;&#x2F;webkit.org&#x2F;blog&#x2F;6017&#x2F;introducing-safari-technology-preview&#x2F;" rel="nofollow">https:&#x2F;&#x2F;webkit.org&#x2F;blog&#x2F;6017&#x2F;introducing-safari-technology-p...</a><p>Edge are actively working on Shadow DOM and Custom Elements support <a href="https:&#x2F;&#x2F;blogs.windows.com&#x2F;msedgedev&#x2F;2015&#x2F;07&#x2F;15&#x2F;microsoft-edge-and-web-components&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blogs.windows.com&#x2F;msedgedev&#x2F;2015&#x2F;07&#x2F;15&#x2F;microsoft-edg...</a><p>Firefox is working on Shadow DOM and Custom Element support as well.<p>The odds are good that other browsers will begin landing these features in their stable releases in 2016.