lector
        string in which case the first matching element will be used
        as context. If missing (or no element matches selector), falls
        back to <code>document</code>.</td></tr></tbody></table><p class="vjs-only"><em id="$$Footer">Defined in <a href="https://github.com/videojs/video.js/blob/master/src/js/component.js#L861">https://github.com/videojs/video.js/blob/master/src/js/component.js line number: 861</a></em></p><p><a href="#top">[back to top]</a></p></div><div id="MethodsaddClass"><