After watching the Polymer Performance Patterns (The Polymer Summit 2015) 
<https://www.youtube.com/watch?v=Yr84DpNaMfk>, I had a couple of questions 
please:

1) For the async attribute on a link tag- will that work? I see in W3C 
async documentation 
<http://www.w3.org/TR/html5/scripting-1.html#attr-script-async> that it 
only mentions it being used on the <script> tag. 

2) Will async parent attribute apply to children <script> tags? For 
instance, <link rel="import" href="imports.html" async> and imports.html 
contains several <link>s and <script> tags without async attributes.

3) I thought Shady Dom was faster. But in the video it mentions for the 
best performance set Polymer to use Shadow. Can this be explained, please? 
In the context that Shady was developed to be faster but Shadow is actually 
faster, please. 

Thank you,
-Darin


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