this jquery plugin extend several jquery functions for web components manpulations specialy accessing web components internal shadow root and template elements:
$.nativeShadowDOM()
this function return true if the browser already support shadow dom natively without any polyfill
$("#element").hasShadowRoot()
this function return true if the selected element has shadow root
$("#element").shadow() or $("#element").getShadowRoot()
this function return the element shadow root as Jquery object where you can access internal template items for example you can do $("#element").shadow().find("#my-button")
$("#element").getOwnerShadowRoot() this function return the parent element shadow root if the selected element is inside a web component template
$("#element").find(":shadow") this psudo selector refere to any elemnt shadow root
also this plugin fix jquery offset() function for any element inside a webcomponent (shadow root)