>
            </dt>
            <dd>
                
            </dd>
            <dt id="isTypeSupported" class="callable">
                <a href="polymer_app_layout/MediaKeys/isTypeSupported.html"><span class="name ">isTypeSupported</span></a><span class="signature">(<wbr><span class="parameter" id="isTypeSupported-param-keySystem"><span class="type-annotation">String</span> <span class="parameter-name">keySystem</span></span>, <span class="parameter" id="isTypeSupported-param-contentType"><span class