What&#x27;s the definition of &quot;older browser&quot; here? As far as I know, polymer also uses a polyfill [1] to provide the web components functionality to older browsers.<p>[1] : <a href="https:&#x2F;&#x2F;www.polymer-project.org&#x2F;1.0&#x2F;resources&#x2F;compatibility.html" rel="nofollow">https:&#x2F;&#x2F;www.polymer-project.org&#x2F;1.0&#x2F;resources&#x2F;compatibility....</a>