Polymer 1.0 doesn&#x27;t use shadow DOM (unless you ask it to). Instead it uses this thing called &#x27;shady DOM&#x27;, which is roughly equivalent but requires accesses to the DOM to go through APIs.<p>See here for the details:<p><a href="https:&#x2F;&#x2F;www.polymer-project.org&#x2F;1.0&#x2F;articles&#x2F;shadydom.html" rel="nofollow">https:&#x2F;&#x2F;www.polymer-project.org&#x2F;1.0&#x2F;articles&#x2F;shadydom.html</a>