[Custom]: Bogus createElement/createElementNS IDL.
https://www.w3.org/Bugs/Public/show_bug.cgi?id=25139
Give template content owners doc an empty registry.

See https://www.w3.org/Bugs/Public/show_bug.cgi?id=23839.
[Custom]: No way to differentiate attribute namespaces in attributeChanged callback.
https://www.w3.org/Bugs/Public/show_bug.cgi?id=24178
Clarify that custom SVG elements must extend an existing SVGElement.
https://www.w3.org/Bugs/Public/show_bug.cgi?id=24176
Add extra line break.
Merge pull request #3 from dglazkov/example

Example
Removed optionalness of namespace argument.
Merge pull request #2 from dglazkov/namespaces

Namespaces
Merge pull request #1 from dglazkov/template-registry

Template registry
Merge pull request #10 from dglazkov/gh-pages

[Custom]: Bogus createElement/createElementNS IDL.