Fix private method registration to work
Fix private method registration to work

This makes <custom-a> display the correct URL for its properties

valmzetvn/html-as-custom-elements,domenic/html-as-custom-elements,zenorocha/html-as-custom-elements,domenic/html-as-custom-elements,valmzetvn/html-as-custom-elements,zenorocha/html-as-custom-elements,domenic/html-as-custom-elements,valmzetvn/html-as-custom-elements