[html-imports] Static import in body tag

[Bang Seongbeom]

Importing needs to be manipulated by script. But it's too verbose to use 
script always.


If link tag can be inserted in body tag, and inserts importee's 
document.body to importer, then it would be easily without any scripts.


An example is below:

component.html:
!DOCTYPE html
div
p class=nameHong Gildong/p
p class=age20/p
/div


index.html:
!DOCTYPE html
html lang=en-US
head
titleHuman Being/title
/head
body
link rel=import href=component.html
/body
/html

[worker] Integration of WorkerGlobalScope and AbstractWorker

[Bang Seongbeom]

The current spec says that the internal worker scope is 
WorkerGlobalScope(or Dedi-, Shared-), the external is AbstractWorker(or 
Worker, Shared-.) But it destroys consistency with Window object and 
confuses users with the difference of WorkerGlobalScope and AbstractWorker.


The global scope Window object can't access to the other Window object 
that's derived from the other origin because of the Same Origin Policy. 
Like this, we can restrict the access by it, not to separate the two 
objects.


And it's hard to understand that why can't terminate in 
WorkerGlobalScope and can't close in AbstractWorker. These two methods 
should be provided equally, or not.

[custom-elements] Prefix x- for custom elements like data- attributes

[Bang Seongbeom]

It would be good to restrict custom element's name to start with like 
'x-' for the future standards. User-defined custom attributes; data 
attributes are also restricted its name to start with 'data-' so we can 
define easily new standard attribute names ('aria-*' or everything 
except for 'data-*'.)