/// /* * Custom Elements */ var fooProto = Object.create(HTMLElement.prototype, { createdCallback() { // `this` should be the created element this.getElementsByTagName("a"); } }); document.registerElement("x-foo", { prototype: fooProto }); window.CustomElements.hasNative; window.CustomElements.flags; window.CustomElements.ready; window.CustomElements.useNative; /* * HTMLImports */ window.HTMLImports.isIE; window.HTMLImports.rootDocument.querySelectorAll("div"); window.HTMLImports.useNative; window.HTMLImports.whenReady(() => { return window.HTMLImports.ready === true; }); document.querySelectorAll(`link[type=${window.HTMLImports.IMPORT_LINK_TYPE}`); /* * Web Components */ window.WebComponents.flags;