the 'child content' span shows in light dom, isn't rendered page (see screenshot).
anyone know why it's not visible? note it's apparently not being slotted, attempt make visible.
<!doctype html> <html> <body> <hello-world> <span>child content</span> </hello-world> <script> var template = ` <span>hello world</span> <slot></slot> `; var myelementproto = object.create(htmlelement.prototype); // fires when instance of element created myelementproto.createdcallback = function() { var shadowroot = this.createshadowroot(); shadowroot.innerhtml = template; }; document.registerelement('hello-world', { prototype: myelementproto }); </script> </body> </html> 
p.s. in chrome 57.0.2987.133
it turns out createshadowroot deprecated. appears want , shows no error, doesn't support slotting (or apparently showing child elements).
swapping createshadowroot() attachshadow({mode: 'open'}) solved problem.
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